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Menu All All. Sign In. Antarctica So she finds a lot of heroin in the false ceiling of a toilet in a filthy bar in Barcelona run by an unpleasant woman Cristina Hoyos. They flee to a remote village where his grandmother Juana Ginzo lives. A moving thriller in the wake of a 'road movie' about the typical theme of a couple pursued by smugglers with all the inconveniences, dangers and subsequent murders that take place. This uneven story is made up of three different elements. On the one hand, the peculiar love relationship that is established along the route between some young people who are only interested in drugs and for whom sex does not exist, which works reasonably well. And, finally, there is the one of the angelic guardian decently played by veteran Walter Vidarte, apparently in charge of watching the couple, who has enough interest, but is adequately developed. Overall it is acceptable and passable film, but not remarkable, displaying several script deficiencies, and not sustaining the necessary interest. It is a movie that had some success and critical consideration in the nineties, but showing a skilled Manuel Huerga too interested in aesthetic effects that he does not quite achieve and does not know what they are for in his story: from the anarchic use of transparencies until the filming in Portugal, which is disconcerting because it is not possible to identify where the action takes place. Main actors : Ariadna Gil and the the debuting actor Carlos Fuentes give so-so acting. But the interpreters have serious diction problems, so much so that the film must be seen with subtitles in order to understand what is happening. The motion picture was professsionally directed by Manuel Huerga , but being paced in fits and starts and feels disjointed. Was this review helpful? Sign in to vote.

A Systematic Review of Simulation Models to Track and Address the Opioid Crisis

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Official websites use. Share sensitive information only on official, secure websites. Cerda nyulangone. The opioid overdose crisis is driven by an intersecting set of social, structural, and economic forces. Simulation models are a tool to help us understand and address thiscomplex, dynamic, and nonlinear social phenomenon. We conducted a systematic review of the literature on simulation models of opioid use and overdose up to September We extracted modeling types, target populations, interventions, and findings; created a database of model parameters used for model calibration; and evaluated study transparency and reproducibility. Of the 1, articles screened, we identified 88 eligible articles. From the 63 studies that provided model parameters, we extracted the data sources on opioid use, OUD, OUD treatment, cessation or relapse, emergency medical services, and death parameters. From this database, potential model inputs can be identified and models can be compared with prior work. Simulation models should be used to tackle key methodological challenges, including the potential for bias in the choice of parameter inputs, investment in model calibration and validation, and transparency in the assumptions and mechanics of simulation models to facilitate reproducibility. Keywords: calibration, opioid use disorder, overdose, parameterization, simulation models. Opioid use is one of the leading public health concerns in countries across the world. The problem is particularly acute in the United States, where more than 50, people died of an opioid overdose in 2. This represented a 4. The opioid overdose crisis is driven by a complex system of social, structural, and economic forces and individual behaviors 5. Supply forces include the increase in prescriptions of opioids for acute and chronic pain, increase in the supply and decline in the price of heroin, and introduction of illegally manufactured synthetics to the drug market, which are cheaper and 30—40 times stronger than heroin 6 , 7. Demand forces include, among others, regional decline in industry activity and weakened institutional protections for worker rights, safety, and benefits, which have led to increasingly precarious employment and wage stagnation; demoralization among people facing unemployment or high-risk, poorly paid work; and increased rates of job-related injury and disability 8 , 9. After the start of the COVID pandemic, the stress of lives lost to COVID, economic hardship, social isolation resulting from pandemic mitigation measures, and potential reduced access to medication for opioid use disorder MOUD may have further contributed to the increase in opioid misuse and overdose risk 10 , Such a complex set of factors interacts in nonlinear ways to shape the different phases of the epidemic 6 , 7 , 9 , 12 , The opioid overdose epidemic is dynamic in space and time. The epidemic was once characterized by overdoses involving prescription opioids; it now has shifted to one characterized by heroin and illegally manufactured synthetic opioid overdoses 14 , In the United States, for example, opioid overdose deaths were first concentrated in states with large rural areas such as Kentucky, West Virginia, and Ohio; in more recent years, however, the number of opioid overdose deaths increased exponentially in the Northeast and Western regions These complex, dynamic, and nonlinear features of the opioid overdose crisis make it more difficult to predict and explain the epidemic. Simulation models are a critical tool to identify and understand a complex, dynamic, nonlinear, social phenomenon such as the opioid overdose crisis The process of building systems-level simulation models forces us to be clear about our assumptions regarding the way systems interact, the availability and quality of data, the way interventions work, and their potential barriers. Simulation approaches can efficiently combine a wide variety of data sources to deliver quantitative results to inform policy. The types of simulation models range widely. They include statistical simulation approaches such as Markov models, which are stochastic models used to model transitions across states, assuming that future states only depend on the current state They also include computational simulation approaches such as system dynamics SD models 19 and agent-based models ABM 20 , 21 , which use computer-based algorithms to model nonlinear relations and feedback processes between units, within and across levels, so small changes in the system can produce emergent properties that are not predicted by individual elements of the model. A classic example of emergence was proposed by Schelling 22 , 23 , who used a checkerboard model that assigned households preference for a certain fraction of their neighbors be the same race to illustrate that population patterns of racial residential segregation emerge that are more extreme than would be predicted from individual preferences. Simulation models have been used to predict and forecast, model potential impacts of intervention and prevention, and assess the risks and benefits of different intervention strategies 24 — In the case of the opioid overdose crisis, simulation models can be used to answer a range of questions. First, simulation models can capture nonlinear interactions between multiple potential predictors of overdose risk, screen out factors that are not predictive of overdose risk, and potentially provide more accurate predictions of the types of drug products, population groups, and geographic areas that can be anticipated to experience an increase in overdoses. Second, they can be used to test assumptions about the underlying mechanisms that give rise to the population distribution of opioid misuse and its consequences, including the roles that availability, accessibility, physical properties of the drug product, and societal sources of demand play in shaping opioid misuse trajectories. Such insights can be critical information to inform the design of prevention programs and policies. Third, simulation models can help predict the types of intervention and policy approaches with the greatest potential to reduce overdoses, in the future, or in new locations, and conduct economic evaluation e. As simulation models to answer questions about opioid misuse proliferate, it is important to assess the scope of research in this area and to investigate the quality and reproducibility of simulation model—based studies of opioid misuse. To this end, we conducted a systematic review of the literature on studies in which researchers developed or used simulation models of opioid misuse. We aimed to provide an overview of the types of questions, simulation models, data sources, and calibration and validation approaches that have been used to address questions related to opioid misuse. We also created a database of model parameters that have been used for model calibration to aid comparative assessment of model findings. Finally, we evaluated study transparency and reproducibility, using a set of previously validated criteria 27 , Although a scoping review has been published in which authors mapped the literature that used simulation models to evaluate or propose policies to address the opioid epidemic 29 , and authors or 2 systematic reviews synthesized cost-based analyses of interventions 30 , 31 , no studies have been conducted yet, to our knowledge, that included the broader range of simulation studies of opioid misuse or provided a critical evaluation of the transparency and reproducibility of reviewed studies. We first searched PubMed for articles that fit our criteria for simulation models. Starting on September 25, , we searched for nonanimal research published in print or electronically in English before September 1, Study inclusion criteria included: 1 use of a simulation modeling approach; and 2 a stage on the pathway from opioid use to overdose i. No geographic exclusion criteria were applied to the review. Decision tree and regression analyses were excluded because these approaches do not explicitly include recursive events and data simulation, respectively. To ensure all relevant journal articles were included, these same terms were then used to search for literature in the Embase and EBSCOhost databases. Conference proceedings and reports are not indexed in these databases; therefore, we also included models we found through citations or via supplementary search in Google Scholar, using the same inclusion criteria. Each study that met the criteria was read in full by 2 of 4 researchers A. The reviewers extracted study information including model type, target population the model is simulating, research question, data sources used to model the simulated populations and interventions, validation and calibration approaches, and findings. For the purpose of data extraction, we defined calibration as an iterative process that entails adjusting model inputs to ensure model outputs match empirical results or expert opinion for a given setting, and we defined validation to mean that the model is acceptable for its intended use based on specified requirements. If studies included model parameters, then those values were extracted as well. We included model parameters that referred to opioid use, OUD, opioid use treatment, emergency medical services, fatal and nonfatal opioid overdose, relapse, and death. We recorded the source, value, and unit for each parameter. Calibrated model parameters were extracted from each article that reported them in the main text or in the appendix. Model parameters were considered calibrated if they were used as inputs to the main model but were derived either via optimization or hand-calibration techniques using data collected by the authors or expert opinion. After the extraction, the model parameters were aggregated, and similar parameters were grouped to draw comparisons between values from different models with different underlying assumptions. In cases where model parameters measured the same phenomena across 2 separate models but were presented using different units, the parameters were standardized against 1 common unit, and the most interpretable and commonly used unit was chosen where possible. Twenty-five criteria were preselected that comprise the minimum elements needed to evaluate the transparency and reproducibility of simulation models To qualify articles on the basis of whether they met these criteria, 2 researchers C. After the pilot test, 2 researchers C. The assessment criteria were divided into 3 categories: development, testing, and analysis. Development criteria included the following: problem clearly defined; modeling method specified; software used reported; modeling objective explicit; modeling scope and boundary clear; conceptualization of the model clear; high-level visualization available; model assumptions disclosed; input parameter values and data sources disclosed; model equations provided; stakeholder engagement described; explicit instructions for replication; and modeling codes provided. Testing criteria included the following: model calibration and parameter estimation performed and described; model evaluation other than calibration and sensitivity analysis performed and described; and quantitative quality-fit calibration to external data reported. Finally, analysis criteria included the following: quantitative results of analysis reported; sensitivity analysis performed and described; policies and intervention strategies discussed; analysis results connected to structural characteristics; research limitations discussed; generalizability of findings discussed; and comparison made with other results. Disclosed sources of funding and conflicts of interest were also assigned point values outside of the predefined categories. Two researchers C. After conflict resolution, each researcher assessed half of the articles independently. Our search results yielded 1, articles, which were imported into the Covidence platform Covidence. After duplicates were removed, 2 reviewers A. The reviewers discussed any studies that did not reach consensus and made a final decision; studies were included in a full-text assessment. Of the remaining studies, 46 were excluded for irrelevant study design i. This left 88 studies for inclusion in the final review. Figure 1 shows the Preferred Reporting Items for Systematic Reviews and Meta-Analyses diagram, which illustrates the inclusion and exclusion process Different approaches were used in the included studies to model the opioid epidemic. In these models, probabilities were defined by groups on the basis of a specific criterion i. In these models, health states were modeled with the assumption that future states rely on the current state, and transition probabilities were mainly included at the population level but sometimes also at the individual level. SD models use a series of stocks and flows and feedback loops to model the opioid epidemic at a population level 83 — ABMs use calculated probabilities at the individual level 97 — The rest of the 10 models included ordinary differential equations transmission — , Monte Carlo simulation , , discrete-event simulation , and decision-analytic — and microsimulation models. Simulation models can be used to examine dynamics at any population size, ranging from a small network of individuals in a neighborhood to an entire country. Regardless of the modeled population size, the goal of simulation models can be to model dynamics within a specific geographic region, which is known as a geographic target population. Of these studies, 5 reported specific calibration methods such as Bayesian inference 68 , 79 , random search algorithm 35 , step-wise approach , maximum likelihood estimation, or other search algorithms e. These calibration approaches used either statistical e. We provide in Web Table 1 additional details of calibration approaches for each study in which specific calibration methods were reported. Multiple types of model validation were conducted across these studies, including internal and external validation, face validation using subject matter experts, cross-validation techniques, and comparing behavior and output from the model to either real-world data or data generated from another model. In several studies, calibration, but not model validation, was conducted. Also, the 2 terms tended to be conflated in some studies and, therefore, it may be difficult to ascertain which of these 2 critically important model-building steps had been conducted across the studies we identified in this review. The studies ranged in what aspect of the opioid epidemic were examined, so we extracted parameters that focused specifically on the pathway of opioid addiction from opioid misuse i. From the 63 studies in which authors provided parameters in these areas of interest, we extracted 1, inputs that resulted in unique parameters. Authors of the remaining 28 studies reported results from their models but either did not give information about how their models were parameterized or the parameters they reported were not on the pathway of opioid addiction. Opioid misuse and OUD had the highest rates of parameterization using primary data sources e. The breakdown of each variable type by data source used to parameterize it can be found in Table 1 , and the studies in which each source was used are listed in Table 2. In many of the studies, authors reported the empirical data used for calibration purposes relied on similar data sources. The studies were assessed against 25 predetermined criteria, which were divided into 3 categories: development, testing, and analysis Figure 2. The modeling problem, objective, and method were defined in each article. In all but 1 article the model boundary was specified; the authors of that article instead aimed to model a generalized drug epidemic Of the 88 articles, 38 reported how stakeholders were engaged throughout the development of the model, allowing insight into how they leveraged different areas of expertise to inform their model 34 , 36 , 40 , 44 , 48 , 51 — 53 , 55 , 56 , 58 , 64 , 66 , 72 , 83 — 88 , 90 , 92 — 98 , , , , — , , , Equations composing the model e. These criteria fell under the development category. Percentage of articles meeting transparency and reproducibility criteria. Light blue: yes criterion was met ; dark blue: no criterion was not met. In 87 of the 88 articles, authors reported their quantitative results, a criterion within the analysis category. In 22 of the articles, authors fulfilled all 3 criteria of placing the study results within the broader context of the literature, including connecting results to model and structural insights 33 , 34 , 36 , 38 , 39 , 41 , 42 , 44 , 52 , 54 , 58 , 62 , 63 , 67 , 70 , 71 , 76 , 77 , 83 , 84 , 85 — 89 , 92 — 95 , 97 , 98 , , — , , , , , comparing with other results 34 — 43 , 44 — 47 , 49 — 54 , 55 , 57 — 59 , 62 , 63 , 65 — 68 , 70 — 78 , 80 , 82 , 83 , 86 , 94 , , , , , , , , , — , and discussing generalizability of findings 34 , 35 , 48 — 57 , 36 , 58 — 64 , 68 , 71 , 72 , 37 , 73 , 76 , 83 — 85 , 87 — 89 , 91 , 92 , 38 , 93 — , 40 , , — , , , — , 43 , , , 44 — Trends in criteria met over time for articles in which model validation was reported via calibration using real data and parameter values, and sources were reported versus those that did not. Modeling codes and instructions for reproducibility were provided in 9 articles; only 3 provided both 56 , , Light blue: yes both criteria were met ; dark blue: no both criteria were not met. Web Table 2 shows model parameters that were calibrated by authors of the 14 articles that reported these values 33 , 37 , 50 , 53 , 57 , 61 , 68 , 77 , 79 , 86 , , , , Two or more separate models calibrated a comparable value for IDU development, MOUD initiation, MOUD exit, baseline overdose rate, increased risk of overdose after relapse from remission due to decreased tolerance, naloxone effectiveness and relative risk of death, fentanyl overdose rates, overdose mortality rates, and all-cause mortality rates generally and during active use. Each model we assessed had different underlying assumptions and structure, which could account for value differences. Notably, the baseline death rates ranged from 0. We did not perform meta-analysis on these values; even though the parameters were comparable, there was still considerable heterogeneity among parameters in each category e. Researchers should use parameters in Web Table 2 with caution, and information on the parameter target population should be assessed to determine whether the parameters are generalizable to the population, setting, and time period simulated in their own model. It is also important to note that Web Table 2 is not meant to be comprehensive and even wide ranges reported in the table might still fall short in presenting high heterogeneities. Research in this space is growing; thus, additional reviews and expansion of this table are- warranted. Simulation models are particularly helpful in predicting the potential benefits and costs of investing in alternative strategies to address opioid misuse; almost half of the studies we reviewed were focused on evaluating the cost-effectiveness of strategies to address the opioid overdose epidemic, and almost one third focused on simulating the impact of increasing access to treatment and harm reduction services on opioid-related harms. The potential use of simulation modeling to understand the mechanisms and feedback processes that give rise to the population distribution of opioid misuse, or to predict the evolution of the overdose epidemic, remain underexplored. As of March , 88 studies were published in which the authors used simulation models of opioid misuse; with the exception of 1 study published in 88 , all other studies were published starting in A range of different simulation models were used to answer questions about opioid misuse. Substantial heterogeneity was found in the estimates reported for some of the key calibrated model parameters across studies, including those associated with IDU and overdose, such as transition probabilities. Differences in modeling approach, data sources, calibrated model parameters, and model assumptions will likely lead to different conclusions to the same research questions, highlighting the vital importance of transparency in the model development process so that models can be replicated and results can be interpreted appropriately. This represents an area for growth in the application of simulation models to opioid misuse; in our assessment, fewer than half of studies presented model equations or provided access to model code and documentation in order to reproduce the reported findings based on the model. The data sources used to calibrate the model play an important role in defining simulation model—based outcomes. Our review highlights 2 key issues with the primary and secondary data sources used to parameterize the pathway of the opioid epidemic. First, many of the studies in which empirical data were used for calibration purposes relied on similar data sources. Any limitations of these data sets will be magnified in opioid simulation models, especially in compartmental models with linked differential equations where calibrating multiple outcomes simultaneously can be difficult. NSDUH, for example, has been shown to substantially under-report OUD , likely due to issues such as reporting bias for stigmatized drugs, and lack of representation of vulnerable populations such as those incarcerated or homeless. Data availability and data quality remain major challenges in simulation models for the opioid epidemic, as is the need to incorporate assumptions about data uncertainty and underestimation into simulation models Second, for most models, researchers relied on published estimates to calibrate input parameters, particularly when calibrating the effect of any kind of intervention such as treatment, emergency medical services, or naloxone. Under ideal circumstances, reported intervention effects obtained from published estimates would be unconfounded; the causal effect of an intervention found in the published population, setting, and time period would be directly transportable to a different site; there would be no selection bias or measurement bias in the evaluation of the intervention effect; and the distributions of unmeasured confounding would be the same in the 2 sites , However, several of these assumptions are often unfulfilled. For example, the prevalence of interacting factors that activate the effect of an exposure and the background prevalence of the disease all modify the effect of such an exposure across sites, raising concerns about the transportability of intervention-effect estimates to simulation models that represent different periods, types of target populations, or geographic areas , Furthermore, in cases of intervention effects that are affected by time-dependent confounding, treating published estimates of past intervention effects as causal effects raises concerns about collider bias These issues highlight 5 priorities for future simulation model—based studies of opioid misuse: 1 incorporate data specific to the target population and period whenever possible; 2 incorporate input from stakeholders on the quality and limitations of local and national data and on sources of variation in assumptions about intervention effects; 3 use transparent approaches during model development to test the extent to which different assumptions about data quality e. Model calibration and validation of simulation model—based studies of opioid misuse is another area that needs much more research attention. Fewer than half of the reviewed studies fulfilled the criteria meant to assess model testing, including reporting the quality of calibration fit to data. To build confidence in the reliability and validity of simulation models and to encourage independent replication of models that simulate opioid misuse, presentation of the quality of model calibration and attempts to validate model results are critical. This is especially true for simulation models developed specifically to support decision-making. As the plethora of simulation models for COVID pandemic have shown, public confidence in models for decision-making relies heavily on the quality of the model calibration and validation procedures For opioid-epidemic simulation models, this can include approaches such as period-by-period processes of calibration-test-recalibration; predictive validation; splitting data into training and testing sets and testing whether a model developed using training data can predict outcomes in the testing set; and testing sensitivity of results to the choice of input parameters, including multivariate sensitivity analysis — There are well-established guidelines for model calibration and validation for dynamical simulation models that should be followed in future simulation modeling studies of the opioid epidemic , This systematic review was focused on simulation models related to opioid misuse. No studies identified in our review simulated co-use of opioids with stimulants or contamination of stimulants with fentanyl and other illegally manufactured synthetic opioids. Hence, the parameters presented in the reviewed papers are likely not applicable to questions of emerging drug-product combinations. As polydrug use emerges as an important driver of overdose trends and data on the national drug supply become available e. Simulation models are an important tool to help us understand the dynamics that give rise to population patterns of opioid misuse and identify the types of interventions that can reduce population rates of opioid misuse in ways we cannot do with real data or in experiments. Increasing application of simulation methods to study opioid misuse and, in particular, to predict potential outcomes and costs associated with interventions to reduce opioid misuse, offers real promise to the field. At the same time, studies applying simulation models to questions of opioid misuse should actively address methodological challenges pervading this field, including the potential for bias in the choice of parameter inputs, investment in calibration and validation, and transparency in the assumptions and mechanics of simulation models that would facilitate reproducibility. Hamilton, Navdep Kaur, Katherine M. The other authors report no conflicts. This section collects any data citations, data availability statements, or supplementary materials included in this article. As a library, NLM provides access to scientific literature. Epidemiol Rev. Ayaz Hyder Find articles by Ayaz Hyder. Navdep Kaur Find articles by Navdep Kaur. Christina Wang Find articles by Christina Wang. All rights reserved. For permissions, please e-mail: journals. Open in a new tab. Click here for additional data file. Similar articles. Add to Collections. Create a new collection. Add to an existing collection. Choose a collection Unable to load your collection due to an error Please try again. Add Cancel. Mortality rate c. Barnett, 63 ; Zarkin, Alistar, 61 ; Alistar, 62 ; Barnett, 63 ; Battista, 33 ; Bayoumi, 52 ; Bernard, 64 ; Bernard, 35 ; Birger, 34 ; Borquez, 53 ; Cepeda, 54 ; Cipriano, 57 ; Enns, 37 ; Fraser, Europe 58 ; Javanbakht, 65 ; King, 81 ; McGregor, 83 ; Morozova, 56 ; Pitt, 90 ; Uyei, 66 ; Vickerman, 49 ; Wakeland, 92 ; Wilson, 39 ; Zaric, 42 ; Zaric, Brandeau, 41 ; Zeiler, 60 ; Zou, Battista, 33 ; Cipriano, 57 ; Coffin, 77 ; Enns, 37 ; Fraser, Scotland ; Irvine, 79 ; Irvine, Chalmers, 85 ; Fraser, Europe Coffin, 77 ; Langham, 82 ; Townsend, ; Uyei, Irvine, 79 ; Townsend, Irvine, Coffin, 78 ; 77 ; Townsend, Pitt, 90 ; Zarkin, Pitt, Caulkins, 36 ; Chalmers, 85 ; Chen, 86 ; Pitt, Chalmers, Gicquelais, Borquez, 53 ; Chen, 86 ; Cipriano, 57 ; Enns, 37 ; Gicquelais, ; Irvine, 79 ; Vickerman, Barbosa, 51 ; Zaric, 42 ; Zaric, Brandeau, Chen, 86 ; Nielsen, 84 ; Wakeland, 93 ; Wakeland, 94 ; Yenikomshian, Chen, White, Wakeland, Chalmers, 85 ; Nielsen, 84 ; Wakeland, Coffin, 78 ; Irvine, Nosyk, 72 ; Wakeland, Barnett, 63 ; Carter, 76 ; Coffin, 78 ; Coffin, 77 ; Jackson, 80 ; Krebs, 71 ; Langham, 82 ; Nielsen, 84 ; Nosyk, 72 ; Uyei, 66 ; Wakeland, 93 ; Wakeland, 94 ; Zaric, 42 ; Zaric, Brandeau, Chen, 86 ; Gicquelais, ; Townsend, Battista, 33 ; Carter, 76 ; Cipriano, ; McGregor, 83 ; Nielsen, 84 ; Pitt, 90 ; Townsend, ; Wakeland, 92 ; Wakeland, 93 ; Yenikomshian, Cipriano, ; Nielsen, Langham, 82 ; Uyei, Cipriano, ; Coffin, 78 ; Coffin, 77 ; Langham, 82 ; Uyei, Langham, Coffin, 77 ; Irvine, 79 ; Irvine, 68 ; Townsend, Cipriano, Mortality rate d. Nielsen, 84 ; Pitt, 90 ; Wakeland, 92 ; Wakeland, Bayoumi, 52 ; Borquez, 53 ; Fraser, Europe 58 ; Morozova, Coffin, 77 ; Ritter, Chen, 86 ; Wakeland, Nielsen, 84 ; Wakeland, 92 ; Wakeland, Bayoumi, 52 ; Cepeda, 54 ; Cipriano, ; Gicquelais, ; Nielsen, 84 ; Nosyk, 38 ; Townsend, ; Wakeland, Cipriano, ; Coffin, 77 ; Langham, Coffin, Gicquelais, ; Irvine, 79 ; Irvine, Zarkin, Wakeland, 93 ; Zarkin,

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