About the Authors

Jiazhi Zeng

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

Leiyu Shi

Affiliations Sun Yat-sen Center for Migrant Health Policy, Sun Yat-sen University, Guangzhou, China, Department of Health Policy and Management, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, United States of America

Xia Zou

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

Wen Chen

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

Li Ling

lingli@mail.sysu.edu.cn

Affiliations Faculty of Medical Statistics and Epidemiology, School of Public Health, Sun Yat-sen University, Guangzhou, China, Sun Yat-sen 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: JZ LS XZ WC LL. Performed the experiments: JZ XZ WC LL. Analyzed the data: JZ LS. Contributed reagents/materials/analysis tools: JZ LS LL. Wrote the paper: JZ LS LL.