About the Authors

Yanwei Lin

Affiliations Faculty of Medical Statistics and Epidemiology, School of Public Health, Sun Yat-sen University, Guangzhou, China, Center for Migrant Health Policy, Sun Yat-sen University, Guangzhou, China, School of Public Health, Baotou Medical College, Baotou, China

Qi Zhang

Affiliations Center for Migrant Health Policy, Sun Yat-sen University, Guangzhou, China, School of Community and Environmental Health, Old Dominion University, Norfolk, Virginia, United States of America

Wen Chen

Affiliations Faculty of Medical Statistics and Epidemiology, School of Public Health, Sun Yat-sen University, Guangzhou, China, Center for Migrant Health Policy, Sun Yat-sen University, Guangzhou, China

Jingrong Shi

Affiliations Faculty of Medical Statistics and Epidemiology, School of Public Health, Sun Yat-sen University, Guangzhou, China, Center for Migrant Health Policy, Sun Yat-sen University, Guangzhou, China

Siqi Han

Affiliations Faculty of Medical Statistics and Epidemiology, School of Public Health, Sun Yat-sen University, Guangzhou, China, Center for Migrant Health Policy, Sun Yat-sen University, Guangzhou, China

Xiaolei Song

Affiliations Faculty of Medical Statistics and Epidemiology, School of Public Health, Sun Yat-sen University, Guangzhou, China, Center for Migrant Health Policy, Sun Yat-sen University, Guangzhou, China

Yong Xu

Affiliations Faculty of Medical Statistics and Epidemiology, School of Public Health, Sun Yat-sen University, Guangzhou, China, Center for Migrant Health Policy, Sun Yat-sen University, Guangzhou, China

Li Ling

lingli@mail.sysu.edu.cn

Current address: #74, Guangzhou, Sun Yat-sen University (North campus), P.R. China

Affiliations Faculty of Medical Statistics and Epidemiology, School of Public Health, Sun Yat-sen University, Guangzhou, China, Center for Migrant Health Policy, Sun Yat-sen University, Guangzhou, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: QZ WC LL. Performed the experiments: SH XS YX. Analyzed the data: JS YX. Contributed reagents/materials/analysis tools: YX. Wrote the paper: YL QZ.