ge ben ha gen she hui xin li wen juan de xin du he xiao du yan jiu
MENG Shi-jiao;YAN Yu-xiang;LIU You-qin;DONG Jing;SONG Man-shu;ZHENG De-yan;WANG Wei Department of Epidemiology and Biostatistics;School of Public Health and Family Medicine;Capital Medical University;Beijing 100069;China