Department of Health-Related Social and Behavioral Sciences West China School of Public Health and West China Fourth Hospital Sichuan University 16 Section 3 Renmin Nan Road Chengdu 610041 China;
Department of Epidemiology and Health Statistics West China School of Public Health and West China Fourth Hospital Sichuan University 16 Section 3 Renmin Nan Road Chengdu 610041 China;
Department of Epidemiology and Health Statistics West China School of Public Health and West China Fourth Hospital Sichuan University 16 Section 3 Renmin Nan Road Chengdu 610041 China;
Sichuan Health Information Center 39 Shangwang Jiaguai Street Chengdu 610041 China;