1 Research Center of Clinical Epidemiology, Peking University Third Hospital, Beijing 100191, China.
2 Department of Epidemiology & Biostatistics, School of Public Health, Peking University Health Science Center, Beijing 100191, China.
3 Peking University Institute of Mental Health, Key Laboratory of Mental Health, Ministry of Health (Peking University), Beijing 100191, China. Email: si.tian-mei@163.com.