[1] Guangdong Med Univ, Sch Publ Hlth, Dept Epidemiol & Stat, Dongguan, Guangdong, Peoples R China
[2] King Abdulaziz Univ, Dept Med, Div Psychiat, Jeddah, Saudi Arabia
[3] Duke Univ, Med Ctr, Dept Psychiat, Durham, NC 27706 USA
[4] Duke Univ, Med Ctr, Dept Med, Durham, NC 27706 USA
[5] Guangdong Med Univ, Sch Publ Hlth, Dept Epidemiol & Stat, Dongguan 560001, Guangdong, Peoples R China