Pub Date : 2025-08-22DOI: 10.1016/j.jinteco.2025.104143
Utsa Banerjee , Luis Castro Peñarrieta , Pavel Chakraborty
Do firms reorganize gender composition of their employment in response to trade shocks? Using novel data on gender composition of employment across several occupational groups for Chilean manufacturing firms matched with customs data for 1995–2007, a developing country with low gender equality, and utilizing the 1998 Chile–Mexico Free Trade Agreement (FTA) as the quasi-natural shock, we document the first evidence that the share of female white-collar workers increased by 10% for new exporters exporting to Mexico due to the FTA. This happened through a substitution effect from male to female high-skilled workers due to higher use of technology (both domestic and foreign), high-skilled non-production tasks, and reduction in discrimination. We also show that this increase in this share of white-collar female workers is due to a demand- rather than supply-side effect. Overall, we emphasize that trade policy can play an important role in addressing the gender gap in employment.
{"title":"Can trade policy change gender equality? Evidence from Chile","authors":"Utsa Banerjee , Luis Castro Peñarrieta , Pavel Chakraborty","doi":"10.1016/j.jinteco.2025.104143","DOIUrl":"10.1016/j.jinteco.2025.104143","url":null,"abstract":"<div><div>Do firms reorganize gender composition of their employment in response to trade shocks? Using novel data on gender composition of employment across several occupational groups for Chilean manufacturing firms matched with customs data for 1995–2007, a developing country with low gender equality, and utilizing the 1998 Chile–Mexico Free Trade Agreement (FTA) as the quasi-natural shock, we document the first evidence that the share of female white-collar workers increased by 10% for new exporters exporting to Mexico due to the FTA. This happened through a substitution effect from male to female high-skilled workers due to higher use of technology (both domestic and foreign), high-skilled non-production tasks, and reduction in discrimination. We also show that this increase in this share of white-collar female workers is due to a demand- rather than supply-side effect. Overall, we emphasize that trade policy can play an important role in addressing the gender gap in employment.</div></div>","PeriodicalId":16276,"journal":{"name":"Journal of International Economics","volume":"157 ","pages":"Article 104143"},"PeriodicalIF":4.0,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144895787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-08-20DOI: 10.1016/j.jinteco.2025.104155
Jonathan Eaton , Marcela Eslava , David Jinkins , C.J. Krizan , James Tybout
Exporting is harder than selling at home, and overcoming barriers takes time. We identify key obstacles to exporting and measure their importance by developing a model of firm-level export dynamics with costly customer search, visibility effects, and learning about product appeal. Fitting the model to U.S. import data on Colombian manufactures, we replicate patterns of exporter maturation. A firm’s customer base and market knowledge are valuable intangible assets: losing both through “market amnesia” would cost Colombian exporters US$14.2 billion, over twice annual exports to the U.S. About a quarter of this reflects lost future sales to current customers; the rest stems from the cost of relearning product appeal and regaining visibility. The frictions we estimate slow trade’s response to shocks: the 10-year export sales response to an exchange rate shock is 48 percent larger than the 1-year response.
{"title":"A search and learning model of export dynamics","authors":"Jonathan Eaton , Marcela Eslava , David Jinkins , C.J. Krizan , James Tybout","doi":"10.1016/j.jinteco.2025.104155","DOIUrl":"10.1016/j.jinteco.2025.104155","url":null,"abstract":"<div><div>Exporting is harder than selling at home, and overcoming barriers takes time. We identify key obstacles to exporting and measure their importance by developing a model of firm-level export dynamics with costly customer search, visibility effects, and learning about product appeal. Fitting the model to U.S. import data on Colombian manufactures, we replicate patterns of exporter maturation. A firm’s customer base and market knowledge are valuable intangible assets: losing both through “market amnesia” would cost Colombian exporters US$14.2 billion, over twice annual exports to the U.S. About a quarter of this reflects lost future sales to current customers; the rest stems from the cost of relearning product appeal and regaining visibility. The frictions we estimate slow trade’s response to shocks: the 10-year export sales response to an exchange rate shock is 48 percent larger than the 1-year response.</div></div>","PeriodicalId":16276,"journal":{"name":"Journal of International Economics","volume":"157 ","pages":"Article 104155"},"PeriodicalIF":4.0,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144913124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-08-15DOI: 10.1016/j.jinteco.2025.104154
Erhan Artuc , Paulo Bastos , Eunhee Lee
We study the welfare effects of international trade on workers with a new dynamic general equilibrium discrete choice model of labor mobility, where the workers’ choice set of jobs is endogenous. Introducing an endogenous number of job options is crucial for matching labor flows in data and quantifying the welfare effects of trade. We exploit differential exposure of sectors and regions to destination-specific demand shocks to estimate the impacts of exports on wages, employment, and labor mobility, using matched employer–employee panel data for Brazil. The same empirical strategy is also applied to estimate structural parameters and the different components of changes in model-implied worker welfare. Counterfactual simulations confirm that the welfare effects of trade are significantly magnified by the introduction of an endogenous number of job options.
{"title":"Trade, jobs, and worker welfare","authors":"Erhan Artuc , Paulo Bastos , Eunhee Lee","doi":"10.1016/j.jinteco.2025.104154","DOIUrl":"10.1016/j.jinteco.2025.104154","url":null,"abstract":"<div><div>We study the welfare effects of international trade on workers with a new dynamic general equilibrium discrete choice model of labor mobility, where the workers’ choice set of jobs is endogenous. Introducing an endogenous number of job options is crucial for matching labor flows in data and quantifying the welfare effects of trade. We exploit differential exposure of sectors and regions to destination-specific demand shocks to estimate the impacts of exports on wages, employment, and labor mobility, using matched employer–employee panel data for Brazil. The same empirical strategy is also applied to estimate structural parameters and the different components of changes in model-implied worker welfare. Counterfactual simulations confirm that the welfare effects of trade are significantly magnified by the introduction of an endogenous number of job options.</div></div>","PeriodicalId":16276,"journal":{"name":"Journal of International Economics","volume":"158 ","pages":"Article 104154"},"PeriodicalIF":4.0,"publicationDate":"2025-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145061351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-08-13DOI: 10.1016/j.jinteco.2025.104145
Jeffrey H. Bergstrand , Matthew W. Clance , J.M.C. Santos Silva
Although there is evidence suggesting that the effects of trade liberalizations likely vary across the distribution of trade flows, trade economists have focused almost entirely on conditional mean estimates of their trade elasticities. We propose the novel use of Poisson-based expectile regressions to estimate the heterogeneous effects of trade liberalizations across the entire conditional distribution. Like standard Poisson regression, this method does not need the dependent variable to be logged, accommodates a mass of observations at zero, and is easy to implement, allowing the estimation of gravity equations with the standard three-way fixed effects specification. Using the proposed estimator, we find systematic evidence that trade liberalizations have larger effects at the lower tail of the conditional distribution. We then use the proposed method to investigate the causes of this heterogeneity, and our results suggest that the success of trade liberalizations strongly depends on potential for expansions along the extensive margin.
{"title":"The tails of gravity: Using expectiles to quantify the trade-margins effects of economic integration agreements","authors":"Jeffrey H. Bergstrand , Matthew W. Clance , J.M.C. Santos Silva","doi":"10.1016/j.jinteco.2025.104145","DOIUrl":"10.1016/j.jinteco.2025.104145","url":null,"abstract":"<div><div>Although there is evidence suggesting that the effects of trade liberalizations likely vary across the distribution of trade flows, trade economists have focused almost entirely on <em>conditional mean</em> estimates of their trade elasticities. We propose the novel use of Poisson-based <em>expectile regressions</em> to estimate the heterogeneous effects of trade liberalizations across the entire conditional distribution. Like standard Poisson regression, this method does not need the dependent variable to be logged, accommodates a mass of observations at zero, and is easy to implement, allowing the estimation of gravity equations with the standard three-way fixed effects specification. Using the proposed estimator, we find systematic evidence that trade liberalizations have larger effects at the lower tail of the conditional distribution. We then use the proposed method to investigate the causes of this heterogeneity, and our results suggest that the success of trade liberalizations strongly depends on potential for expansions along the extensive margin.</div></div>","PeriodicalId":16276,"journal":{"name":"Journal of International Economics","volume":"157 ","pages":"Article 104145"},"PeriodicalIF":4.0,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144865841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-08-13DOI: 10.1016/j.jinteco.2025.104141
Marcos Mac Mullen , Soo Kyung Woo
This paper studies the drivers of the US real exchange rate (RER), with a particular focus on its comovement with net trade (NT) flows. We consider the entire spectrum of frequencies, as the low-frequency variation accounts for 62 and 64 percent of the unconditional variance of the RER and NT, respectively. We develop a generalization of the standard international business cycle model that successfully rationalizes the joint dynamics of the RER and NT while accounting for the major puzzles of the RER. We find that, while financial shocks are necessary to capture high frequency variation in the RER, trade shocks are essential for the lower frequency fluctuations.
{"title":"Real exchange rate and net trade dynamics: Financial and trade shocks","authors":"Marcos Mac Mullen , Soo Kyung Woo","doi":"10.1016/j.jinteco.2025.104141","DOIUrl":"10.1016/j.jinteco.2025.104141","url":null,"abstract":"<div><div>This paper studies the drivers of the US real exchange rate (RER), with a particular focus on its comovement with net trade (NT) flows. We consider the entire spectrum of frequencies, as the low-frequency variation accounts for 62 and 64 percent of the unconditional variance of the RER and NT, respectively. We develop a generalization of the standard international business cycle model that successfully rationalizes the joint dynamics of the RER and NT while accounting for the major puzzles of the RER. We find that, while financial shocks are necessary to capture high frequency variation in the RER, trade shocks are essential for the lower frequency fluctuations.</div></div>","PeriodicalId":16276,"journal":{"name":"Journal of International Economics","volume":"157 ","pages":"Article 104141"},"PeriodicalIF":4.0,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144895690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-08-11DOI: 10.1016/j.jinteco.2025.104142
Oliver de Groot , C. Bora Durdu , Enrique G. Mendoza
We compare global (fixed-point iteration) and local (first-order, higher-order, risky-steady-state, and quasi-linear) solutions of open-economy incomplete-markets models. Cyclical moments of a workhorse endowment model are broadly in line with the data and similar across solutions calibrated to the same data targets, but impulse responses and spectral densities differ. Alternative local solutions yield nearly identical results. Calibrating them requires nontrivial interest-rate elasticities that make net foreign assets (NFA) “sticky,” causing them to differ sharply from global solutions in experiments altering precautionary savings (e.g., increasing income volatility, adding capital controls). Analytic and numerical results show that our findings are due to the near-unit-root nature of NFA under incomplete markets and imprecise solutions of their autocorrelation. These findings extend to a Sudden Stops model with an occasionally binding collateral constraint. In addition, quasi-linear methods yield smaller financial premia and macroeconomic responses when the constraint binds.
{"title":"Why global and local solutions of open-economy models with incomplete markets differ and why it matters","authors":"Oliver de Groot , C. Bora Durdu , Enrique G. Mendoza","doi":"10.1016/j.jinteco.2025.104142","DOIUrl":"10.1016/j.jinteco.2025.104142","url":null,"abstract":"<div><div>We compare global (fixed-point iteration) and local (first-order, higher-order, risky-steady-state, and quasi-linear) solutions of open-economy incomplete-markets models. Cyclical moments of a workhorse endowment model are broadly in line with the data and similar across solutions calibrated to the same data targets, but impulse responses and spectral densities differ. Alternative local solutions yield nearly identical results. Calibrating them requires nontrivial interest-rate elasticities that make net foreign assets (NFA) “sticky,” causing them to differ sharply from global solutions in experiments altering precautionary savings (e.g., increasing income volatility, adding capital controls). Analytic and numerical results show that our findings are due to the near-unit-root nature of NFA under incomplete markets and imprecise solutions of their autocorrelation. These findings extend to a Sudden Stops model with an occasionally binding collateral constraint. In addition, quasi-linear methods yield smaller financial premia and macroeconomic responses when the constraint binds.</div></div>","PeriodicalId":16276,"journal":{"name":"Journal of International Economics","volume":"158 ","pages":"Article 104142"},"PeriodicalIF":4.0,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-08-09DOI: 10.1016/j.jinteco.2025.104146
Jens H.E. Christensen , Nikola N. Mirkov , Xin Zhang
Through large-scale asset purchases, widely known as quantitative easing (QE), central banks around the world have affected the supply of safe assets by buying quasi-safe bonds in exchange for truly safe reserves. We examine the pricing effects of the European Central Bank’s bond purchases in the 2015–2021 period on an international panel of bond safety premia from four highly rated countries: Denmark, Germany, Sweden, and Switzerland. We find statistically significant negative effects for all four countries, highlighting an international spillover channel through which QE programs reduce bond safety premia by expanding the supply of truly safe assets.
{"title":"Quantitative easing and the supply of safe assets: Evidence from international bond safety premia","authors":"Jens H.E. Christensen , Nikola N. Mirkov , Xin Zhang","doi":"10.1016/j.jinteco.2025.104146","DOIUrl":"10.1016/j.jinteco.2025.104146","url":null,"abstract":"<div><div>Through large-scale asset purchases, widely known as quantitative easing (QE), central banks around the world have affected the supply of safe assets by buying quasi-safe bonds in exchange for truly safe reserves. We examine the pricing effects of the European Central Bank’s bond purchases in the 2015–2021 period on an international panel of bond safety premia from four highly rated countries: Denmark, Germany, Sweden, and Switzerland. We find statistically significant negative effects for all four countries, highlighting an international spillover channel through which QE programs reduce bond safety premia by expanding the supply of truly safe assets.</div></div>","PeriodicalId":16276,"journal":{"name":"Journal of International Economics","volume":"157 ","pages":"Article 104146"},"PeriodicalIF":4.0,"publicationDate":"2025-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144865842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-08-06DOI: 10.1016/j.jinteco.2025.104129
Hang Do , Kiet Tuan Duong , Luu Duc Toan Huynh , Nam T. Vu
Using the distance to the Irish border of UK firms that have not changed their location since the 2016 Referendum to isolate the effects of Brexit at the firm level, we find that Brexit implementation in 2020 caused exposed firms to cut their workforce by up to 15.7% on average relative to non-exposed firms. These exposed firms are also more likely to have lower growth expectations and more likely to increase their research and development (R&D) expenditure. In addition, having ex-ante trade exposure, either with or outside the EU, can help alleviate such negative effects of Brexit. Such results highlight the role of trade exposure and the expectation channel, and support the hypothesis that firms prioritize innovations in response to Brexit.
{"title":"The Real effects of Brexit on labor demand: Evidence from firm-level data","authors":"Hang Do , Kiet Tuan Duong , Luu Duc Toan Huynh , Nam T. Vu","doi":"10.1016/j.jinteco.2025.104129","DOIUrl":"10.1016/j.jinteco.2025.104129","url":null,"abstract":"<div><div>Using the distance to the Irish border of UK firms that have not changed their location since the 2016 Referendum to isolate the effects of Brexit at the firm level, we find that Brexit implementation in 2020 caused exposed firms to cut their workforce by up to 15.7% on average relative to non-exposed firms. These exposed firms are also more likely to have lower growth expectations and more likely to increase their research and development (R&D) expenditure. In addition, having ex-ante trade exposure, either with or outside the EU, can help alleviate such negative effects of Brexit. Such results highlight the role of trade exposure and the expectation channel, and support the hypothesis that firms prioritize innovations in response to Brexit.</div></div>","PeriodicalId":16276,"journal":{"name":"Journal of International Economics","volume":"157 ","pages":"Article 104129"},"PeriodicalIF":4.0,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144831571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-08-05DOI: 10.1016/j.jinteco.2025.104140
Simon Alder
India and China followed different strategies in the design of their recent highway networks. India first focused on connecting the four largest economic centers of the country, the Golden Quadrilateral, while China had the explicit strategy of connecting intermediate-sized cities. This paper analyzes the aggregate and distributional effects of transport infrastructure in India based on a general equilibrium trade framework. I compare the effect of the Golden Quadrilateral to a counterfactual network that connects India’s intermediate-sized cities. To construct the counterfactual network, I propose a heuristic network design algorithm to maximize aggregate real income net of road construction costs in the general equilibrium model, and I show that the heuristic algorithm provides a good approximation of the optimal network. The results suggest that the actual network led to sizable aggregate gains but unequal effects across regions. The income-maximizing counterfactual network is substantially larger than the actual Indian network, would imply further aggregate gains, and would benefit the lagging regions of India.
{"title":"Chinese roads in India: The effect of transport infrastructure on economic development","authors":"Simon Alder","doi":"10.1016/j.jinteco.2025.104140","DOIUrl":"10.1016/j.jinteco.2025.104140","url":null,"abstract":"<div><div>India and China followed different strategies in the design of their recent highway networks. India first focused on connecting the four largest economic centers of the country, the Golden Quadrilateral, while China had the explicit strategy of connecting intermediate-sized cities. This paper analyzes the aggregate and distributional effects of transport infrastructure in India based on a general equilibrium trade framework. I compare the effect of the Golden Quadrilateral to a counterfactual network that connects India’s intermediate-sized cities. To construct the counterfactual network, I propose a heuristic network design algorithm to maximize aggregate real income net of road construction costs in the general equilibrium model, and I show that the heuristic algorithm provides a good approximation of the optimal network. The results suggest that the actual network led to sizable aggregate gains but unequal effects across regions. The income-maximizing counterfactual network is substantially larger than the actual Indian network, would imply further aggregate gains, and would benefit the lagging regions of India.</div></div>","PeriodicalId":16276,"journal":{"name":"Journal of International Economics","volume":"157 ","pages":"Article 104140"},"PeriodicalIF":4.0,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144892229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-08-05DOI: 10.1016/j.jinteco.2025.104139
Maximilian Boeck , Lorenzo Mori
We estimate a time-varying parameter vector autoregression to examine the evolution of international spillovers of U.S. monetary policy in light of increasing globalization in real and financial markets. We find that the adverse international effects of a U.S. tightening have substantially increased over the past three decades, peaking during the Great Recession before stabilizing – a timing that aligns well with observed trends in globalization and slowbalization dynamics. Cross-country analysis and counterfactual simulations suggest that the estimated amplification of the spillover effects over time has been primarily driven by the surge in trade integration, while rising financial integration has contributed only modestly.
{"title":"Has globalization changed the international transmission of U.S. monetary policy?","authors":"Maximilian Boeck , Lorenzo Mori","doi":"10.1016/j.jinteco.2025.104139","DOIUrl":"10.1016/j.jinteco.2025.104139","url":null,"abstract":"<div><div>We estimate a time-varying parameter vector autoregression to examine the evolution of international spillovers of U.S. monetary policy in light of increasing globalization in real and financial markets. We find that the adverse international effects of a U.S. tightening have substantially increased over the past three decades, peaking during the Great Recession before stabilizing – a timing that aligns well with observed trends in globalization and slowbalization dynamics. Cross-country analysis and counterfactual simulations suggest that the estimated amplification of the spillover effects over time has been primarily driven by the surge in trade integration, while rising financial integration has contributed only modestly.</div></div>","PeriodicalId":16276,"journal":{"name":"Journal of International Economics","volume":"157 ","pages":"Article 104139"},"PeriodicalIF":4.0,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144780981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}