Li Zhao1, Daniel T L Shek2, Kun Zou1, Yalin Lei1,3, Peng Jia4,5. 1. Department of Health Policy and Management, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, China. 2. Department of Applied Social Sciences, Hong Kong Polytechnic University, Hong Kong, China. 3. Department of Disease Prevention and Control, Chengdu Health Commission, Chengdu, China. 4. School of Resources and Environmental Science, Wuhan University, Wuhan, China. 5. International Institute of Spatial Lifecourse Epidemiology (ISLE), Wuhan University, Wuhan, China.