[1] Ningxia Med Univ, Sch Publ Hlth & Management, Dept Epidemiol & Stat, Yinchuan, Ningxia, Peoples R China
[2] Guangdong Med Univ, Dept Epidemiol & Stat, Sch Publ Hlth, 1 Keyuan St, Dongguan 560001, Guangdong, Peoples R China
[3] Shandong Univ, Sch Publ Hlth, Jinan, Peoples R China
[4] Futian Ctr Chron Dis Control, Dept Mental Hlth, Shenzhen, Peoples R China
[5] Baoji Maternal & Child Hlth Hosp, Baoji, Peoples R China