Identifying the factors that influence labor force participation could elucidate how individuals arrive at their labor supply decisions, whose understanding is, in turn, of crucial importance in analyzing how the supply side of the labor market functions. This paper investigates the effect of parenthood status on Labor Force Participation (LFP) decisions using an individual-level fixed-effects identification strategy. The differences across individuals and over time in having or not having children as well as being or not being in the labor force provide the variation needed to assess the association between individuals’ LFP behavior and parenthood. Parenthood could have different impacts on mothers than it would on fathers. In order to look at the causal effect of maternity and paternity on LFP separately, the data is disaggregated by gender. To this end, the effect of a change in the parenthood status can be measured using individual-level fixed-effects to account for time-invariant characteristics of individuals becoming a parent. The primary data source used is the National Longitudinal Surveys (NLS). Considering the nature of LFP variable, this paper employs Binary Response Models (BRMs) to estimate LFP equations using individual-level micro data. The findings of the study show that parenthood has a negative overall effect on LFP. However, paternity has a significant positive effect on the likelihood of being in the labor force, whilst maternity has a significant negative impact of LFP. In addition, the results imply that the effect of parenthood on LFP has been fading away over time, regardless of the gender of parents. These two pieces of evidence precisely map onto the theoretical predictions made by the related mainstream economic theories (the traditional neoclassical theory of labor supply as well as Becker’s household production model). These results are robust across different models specified and various estimation methods employed. These findings can contribute to the existing knowledge about the effect of parenthood on LFP decisions made in the US at an individual and behavioral level, and also aid in the shaping of economic policies and interventions to enhance the status of labor force participation in the economy. In the end, some potential threats to the identification of this causal effect, such as endogeneity of fertility, and some possible strategies to deal with those threats are discussed.
{"title":"Identifying the Effect of Parenthood on Labor Force Participation: A Gender Comparison","authors":"Seyyed Ali Zeytoon Nejad Moosavian","doi":"10.2139/ssrn.2897196","DOIUrl":"https://doi.org/10.2139/ssrn.2897196","url":null,"abstract":"Identifying the factors that influence labor force participation could elucidate how individuals arrive at their labor supply decisions, whose understanding is, in turn, of crucial importance in analyzing how the supply side of the labor market functions. This paper investigates the effect of parenthood status on Labor Force Participation (LFP) decisions using an individual-level fixed-effects identification strategy. The differences across individuals and over time in having or not having children as well as being or not being in the labor force provide the variation needed to assess the association between individuals’ LFP behavior and parenthood. Parenthood could have different impacts on mothers than it would on fathers. In order to look at the causal effect of maternity and paternity on LFP separately, the data is disaggregated by gender. To this end, the effect of a change in the parenthood status can be measured using individual-level fixed-effects to account for time-invariant characteristics of individuals becoming a parent. The primary data source used is the National Longitudinal Surveys (NLS). Considering the nature of LFP variable, this paper employs Binary Response Models (BRMs) to estimate LFP equations using individual-level micro data. The findings of the study show that parenthood has a negative overall effect on LFP. However, paternity has a significant positive effect on the likelihood of being in the labor force, whilst maternity has a significant negative impact of LFP. In addition, the results imply that the effect of parenthood on LFP has been fading away over time, regardless of the gender of parents. These two pieces of evidence precisely map onto the theoretical predictions made by the related mainstream economic theories (the traditional neoclassical theory of labor supply as well as Becker’s household production model). These results are robust across different models specified and various estimation methods employed. These findings can contribute to the existing knowledge about the effect of parenthood on LFP decisions made in the US at an individual and behavioral level, and also aid in the shaping of economic policies and interventions to enhance the status of labor force participation in the economy. In the end, some potential threats to the identification of this causal effect, such as endogeneity of fertility, and some possible strategies to deal with those threats are discussed.","PeriodicalId":111949,"journal":{"name":"Econometric Modeling: Microeconometric Models of Household Behavior eJournal","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130085830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-01-01DOI: 10.5089/9781475573084.001.A001
E. Vihriälä
We study Japanese household consumption at a disaggregated level focusing on the role of income and asset dynamics. Stagnation of real per capita consumption is widespread across labor market groups, age groups and regions. Consumption-to-income ratios have been mildly increasing due to the rising share of pensioners with significant assets. Evidence therefore suggests that assets have become more important in financing consumption. However, the short-term consumption dynamics remain quite sensitive to income growth but not to asset market movements.
{"title":"Household Consumption in Japan - Role of Income and Asset Developments","authors":"E. Vihriälä","doi":"10.5089/9781475573084.001.A001","DOIUrl":"https://doi.org/10.5089/9781475573084.001.A001","url":null,"abstract":"We study Japanese household consumption at a disaggregated level focusing on the role of income and asset dynamics. Stagnation of real per capita consumption is widespread across labor market groups, age groups and regions. Consumption-to-income ratios have been mildly increasing due to the rising share of pensioners with significant assets. Evidence therefore suggests that assets have become more important in financing consumption. However, the short-term consumption dynamics remain quite sensitive to income growth but not to asset market movements.","PeriodicalId":111949,"journal":{"name":"Econometric Modeling: Microeconometric Models of Household Behavior eJournal","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132833071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Traditionally, households have been seen as acting as a single unit when it comes to savings. Although this might be correct for some parts of household savings, we question the correctness of the unitary model with respect to non-mandatory retirement savings. To answer this question we analyze the intra-household allocation of retirement savings between partners in Germany. First, the decision to save at all is analyzed using a seemingly unrelated bivariate probit model, showing that the possession of retirement saving accounts among spouses is positively correlated, hinting at a 'crowding-in' of saving accounts. However, this could be only due to some tax reasons. Thus, we analyze additionally the interaction of savings between spouses using three-stage least squares, allowing for endogeneity between the spouse's savings. These results additionally show a 'crowding-in' of total retirement saving amounts between spouses, probably due to some 'recognition effect'. The unitary model of household decision making can thus be rejected with respect to retirement savings.
{"title":"Intra-Household Allocation of Non-Mandatory Retirement Savings","authors":"Christoph Metzger","doi":"10.2139/ssrn.2774243","DOIUrl":"https://doi.org/10.2139/ssrn.2774243","url":null,"abstract":"Traditionally, households have been seen as acting as a single unit when it comes to savings. Although this might be correct for some parts of household savings, we question the correctness of the unitary model with respect to non-mandatory retirement savings. To answer this question we analyze the intra-household allocation of retirement savings between partners in Germany. First, the decision to save at all is analyzed using a seemingly unrelated bivariate probit model, showing that the possession of retirement saving accounts among spouses is positively correlated, hinting at a 'crowding-in' of saving accounts. However, this could be only due to some tax reasons. Thus, we analyze additionally the interaction of savings between spouses using three-stage least squares, allowing for endogeneity between the spouse's savings. These results additionally show a 'crowding-in' of total retirement saving amounts between spouses, probably due to some 'recognition effect'. The unitary model of household decision making can thus be rejected with respect to retirement savings.","PeriodicalId":111949,"journal":{"name":"Econometric Modeling: Microeconometric Models of Household Behavior eJournal","volume":"132 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116623325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This guide, updated for the 2016-17 job market season, describes the U.S. academic market for new Ph.D. economists and offers advice on conducting an academic job search. It provides data, reports findings from published papers, describes practical details, and includes links to online resources. Topics addressed include: preparing to go on the market; applying for academic jobs; the JOE Network, which is the AEA's electronic clearinghouse for the job market; signaling; interviewing at the ASSA meetings; campus visits; the secondary market scramble; offers and negotiating; getting off to a good start as an assistant professor; diversity; and dual job searches.
{"title":"The Labour Market Effect of Immigration: Accounting for Effective Immigrant Work Experience in New Zealand","authors":"Michael M. H. Tse, S. Maani","doi":"10.2139/ssrn.2889668","DOIUrl":"https://doi.org/10.2139/ssrn.2889668","url":null,"abstract":"This guide, updated for the 2016-17 job market season, describes the U.S. academic market for new Ph.D. economists and offers advice on conducting an academic job search. It provides data, reports findings from published papers, describes practical details, and includes links to online resources. Topics addressed include: preparing to go on the market; applying for academic jobs; the JOE Network, which is the AEA's electronic clearinghouse for the job market; signaling; interviewing at the ASSA meetings; campus visits; the secondary market scramble; offers and negotiating; getting off to a good start as an assistant professor; diversity; and dual job searches.","PeriodicalId":111949,"journal":{"name":"Econometric Modeling: Microeconometric Models of Household Behavior eJournal","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121780496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We study the short- to medium-run effects of starting a career on a fixed-term contract on subsequent fertility outcomes. We focus on the career start since we expect that temporary contracts and their inherent economic uncertainty imply a path dependency which might have spill-over effects on other domains of life. Our empirical analysis is based on rich data from the German Socio-Economic Panel which provides comprehensive information about individuals' labour market history as well as fertility behaviour. Our main results are: Women (i) tend to postpone their first birth due to fixed-term employment at labour market entry and (ii) reduce the number of children in the first 10 years after graduation. These associations are strongest in the subsample of native women with at least vocational training. (iii) In contrast, we find no significant correlations for men. We argue that these findings are robust to potential endogeneity threats.
{"title":"Fixed-Term Employment and Fertility: Evidence from German Micro Data","authors":"W. Auer, Natalia Weißhaar","doi":"10.1093/CESIFO/IFV014","DOIUrl":"https://doi.org/10.1093/CESIFO/IFV014","url":null,"abstract":"We study the short- to medium-run effects of starting a career on a fixed-term contract on subsequent fertility outcomes. We focus on the career start since we expect that temporary contracts and their inherent economic uncertainty imply a path dependency which might have spill-over effects on other domains of life. Our empirical analysis is based on rich data from the German Socio-Economic Panel which provides comprehensive information about individuals' labour market history as well as fertility behaviour. Our main results are: Women (i) tend to postpone their first birth due to fixed-term employment at labour market entry and (ii) reduce the number of children in the first 10 years after graduation. These associations are strongest in the subsample of native women with at least vocational training. (iii) In contrast, we find no significant correlations for men. We argue that these findings are robust to potential endogeneity threats.","PeriodicalId":111949,"journal":{"name":"Econometric Modeling: Microeconometric Models of Household Behavior eJournal","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129545321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
There is growing evidence that noncognitive skills affect economic, behavioral, and demographic outcomes in the developed world. However, little such evidence exists from developing countries. This paper estimates the joint effect of five specific personality traits and cognition on a sequence of labor market outcomes for a sample of Malagasy individuals as they transition from adolescence to young adulthood. Specifically we model these individuals' age of entry into the labor market, labor market sectoral selection, and within sector earnings. The personality traits we examine are the Big Five Personality Traits: Openness to Experience, Conscientiousness, Extraversion, Agreeableness, and Neuroticism. Additionally, we look at how these traits interact with household-level shocks in determining their labor market entry decisions. We find that personality, as well as cognitive test scores, affect these outcomes of interest, and that their impact on labor supply is, in part, a function of how individuals respond to exogenous shocks.
{"title":"Labor Outcomes During the Transition from Adolescence to Adulthood: The Role of Personality, Cognition, and Shocks in Madagascar","authors":"D. Sahn, Kira M Villa","doi":"10.2139/ssrn.2872616","DOIUrl":"https://doi.org/10.2139/ssrn.2872616","url":null,"abstract":"There is growing evidence that noncognitive skills affect economic, behavioral, and demographic outcomes in the developed world. However, little such evidence exists from developing countries. This paper estimates the joint effect of five specific personality traits and cognition on a sequence of labor market outcomes for a sample of Malagasy individuals as they transition from adolescence to young adulthood. Specifically we model these individuals' age of entry into the labor market, labor market sectoral selection, and within sector earnings. The personality traits we examine are the Big Five Personality Traits: Openness to Experience, Conscientiousness, Extraversion, Agreeableness, and Neuroticism. Additionally, we look at how these traits interact with household-level shocks in determining their labor market entry decisions. We find that personality, as well as cognitive test scores, affect these outcomes of interest, and that their impact on labor supply is, in part, a function of how individuals respond to exogenous shocks.","PeriodicalId":111949,"journal":{"name":"Econometric Modeling: Microeconometric Models of Household Behavior eJournal","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129347552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Since 1970, housing's relative price, share of expenditure, and ``unaffordability'' have all grown. We estimate housing demand using a novel compensated framework over space and an uncompensated framework over time. Our specifications pass tests imposed by rationality and household mobility. Housing demand is income and price inelastic, and appears to fall with household size. We provide a numerical non-homothetic constant elasticity of substitution utility function for improved quantitative modeling. An ideal cost-of-living index demonstrates that the poor have been disproportionately impacted by rising relative rents, which have greatly amplified increases in real income inequality.
{"title":"Housing Demand, Cost-of-Living Inequality, and the Affordability Crisis","authors":"David Albouy, Gabriel Ehrlich, Yingyi Liu","doi":"10.3386/W22816","DOIUrl":"https://doi.org/10.3386/W22816","url":null,"abstract":"Since 1970, housing's relative price, share of expenditure, and ``unaffordability'' have all grown. We estimate housing demand using a novel compensated framework over space and an uncompensated framework over time. Our specifications pass tests imposed by rationality and household mobility. Housing demand is income and price inelastic, and appears to fall with household size. We provide a numerical non-homothetic constant elasticity of substitution utility function for improved quantitative modeling. An ideal cost-of-living index demonstrates that the poor have been disproportionately impacted by rising relative rents, which have greatly amplified increases in real income inequality.","PeriodicalId":111949,"journal":{"name":"Econometric Modeling: Microeconometric Models of Household Behavior eJournal","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116109531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study explores if declining employment in routine middle-skilled jobs as a result of technological change is creating more over-educated workers in the low skilled non-routine manual jobs. Using data from European Labour Force Survey covering the period from 1999 to 2007, the paper analyses employment change and over-education in four countries of Europe – Germany, Spain, Sweden and UK. The results suggest higher incidence of over-education in polarized countries – Spain and UK as compared to countries with employment upgrading – Germany and Sweden. It also reveals that in Spain and UK, over-education is prominent and increasing over time in the low paid jobs which are mostly non-routine manual in nature, while Germany and Sweden have more over-educated workers in middle skilled routine and high skilled analytical jobs. I find similar results in both descriptive and job fixed effects regressions.
{"title":"Is Employment Polarization Creating More Over-Educated Workers? Evidence from Germany, Spain, Sweden and UK","authors":"Sudipa Sarkar","doi":"10.2139/ssrn.2843173","DOIUrl":"https://doi.org/10.2139/ssrn.2843173","url":null,"abstract":"This study explores if declining employment in routine middle-skilled jobs as a result of technological change is creating more over-educated workers in the low skilled non-routine manual jobs. Using data from European Labour Force Survey covering the period from 1999 to 2007, the paper analyses employment change and over-education in four countries of Europe – Germany, Spain, Sweden and UK. The results suggest higher incidence of over-education in polarized countries – Spain and UK as compared to countries with employment upgrading – Germany and Sweden. It also reveals that in Spain and UK, over-education is prominent and increasing over time in the low paid jobs which are mostly non-routine manual in nature, while Germany and Sweden have more over-educated workers in middle skilled routine and high skilled analytical jobs. I find similar results in both descriptive and job fixed effects regressions.","PeriodicalId":111949,"journal":{"name":"Econometric Modeling: Microeconometric Models of Household Behavior eJournal","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114748885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Analysis of the dynamics of lending and household deposits allows to find interesting models of consumer behaviour from the perspective of consumption and savings balance. They fit into four provisional, sequentially alternating types of population’s activity, which often depend on the number and content of information in the “news-driven economy”. In these circumstances, archaic strategies of financial behaviour gain ground.
{"title":"Strategies of Financial Behaviour of the Population: Under the Pressure of 'News-Driven Economy'","authors":"A. Polyakova","doi":"10.2139/SSRN.2841196","DOIUrl":"https://doi.org/10.2139/SSRN.2841196","url":null,"abstract":"Analysis of the dynamics of lending and household deposits allows to find interesting models of consumer behaviour from the perspective of consumption and savings balance. They fit into four provisional, sequentially alternating types of population’s activity, which often depend on the number and content of information in the “news-driven economy”. In these circumstances, archaic strategies of financial behaviour gain ground.","PeriodicalId":111949,"journal":{"name":"Econometric Modeling: Microeconometric Models of Household Behavior eJournal","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115971865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This is the first study to investigate the short- and long-term causal effects of a child-labor ban. The study explores the law that increased the minimum employment age from 14 to 16 in Brazil in 1998, and uncovers its impact on time allocated to schooling and work in the short term and on school attainment and labor market outcomes in the long term. The analysis uses cross-sectional data from 1998 to 2014, and applies a fuzzy regression discontinuity design to estimate the impact of the ban at different points of individuals’ lifecycles. The estimates show that the ban reduced the incidence of boys in paid work activities by 4 percentage points or 27 percent. The study finds that the fall in child labor is mostly explained by the change in the proportions of boys working for pay and studying, and observes an increase in the proportion of boys only studying as a consequence. The results suggest that the ban reduced boys’ participation in the labor force. The study follows the same cohort affected by the ban over the years, and finds that the short-term effects persisted until 2003 when the boys turned 18. The study pooled data from 2007 to 2014 to check whether the ban affected individuals’ stock of human capital and labor market outcomes. The estimates suggest that the ban did not have long-term effects for the whole cohort, but found some indication that it did negatively affect the log earnings of individuals at the lower tail of the earnings distribution.
{"title":"Short- and Long-Term Effects of a Child-Labor Ban","authors":"Caio Piza, André Portela Souza","doi":"10.1596/1813-9450-7796","DOIUrl":"https://doi.org/10.1596/1813-9450-7796","url":null,"abstract":"This is the first study to investigate the short- and long-term causal effects of a child-labor ban. The study explores the law that increased the minimum employment age from 14 to 16 in Brazil in 1998, and uncovers its impact on time allocated to schooling and work in the short term and on school attainment and labor market outcomes in the long term. The analysis uses cross-sectional data from 1998 to 2014, and applies a fuzzy regression discontinuity design to estimate the impact of the ban at different points of individuals’ lifecycles. The estimates show that the ban reduced the incidence of boys in paid work activities by 4 percentage points or 27 percent. The study finds that the fall in child labor is mostly explained by the change in the proportions of boys working for pay and studying, and observes an increase in the proportion of boys only studying as a consequence. The results suggest that the ban reduced boys’ participation in the labor force. The study follows the same cohort affected by the ban over the years, and finds that the short-term effects persisted until 2003 when the boys turned 18. The study pooled data from 2007 to 2014 to check whether the ban affected individuals’ stock of human capital and labor market outcomes. The estimates suggest that the ban did not have long-term effects for the whole cohort, but found some indication that it did negatively affect the log earnings of individuals at the lower tail of the earnings distribution.","PeriodicalId":111949,"journal":{"name":"Econometric Modeling: Microeconometric Models of Household Behavior eJournal","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127996743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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