[1] Nanjing Med Univ, Sch Publ Hlth, Dept Social Med & Hlth Educ, Nanjing, Jiangsu, Peoples R China
[2] Chinese Univ Hong Kong, Prince Wales Hosp, Sch Publ Hlth & Primary Care, Fac Med,Ctr Hlth Behav Res,Sch Publ Hlth, Shatin, Hong Kong, Peoples R China
[3] Sun Yat Sen Univ, Ctr Med Anthropol & Behav Hlth, Guangzhou 510275, Guangdong, Peoples R China
[4] Sun Yat Sen Univ, Sch Publ Hlth, Dept Med Stat & Epidemiol, Guangzhou 510275, Guangdong, Peoples R China