[1] Cent South Univ, Xiangya Sch Publ Hlth, Dept Epidemiol & Biostat, Changsha, Hunan, Peoples R China
[2] Chinese Ctr Dis Control & Prevent, Natl Ctr Chron & Noncommunicable Dis Control & Pr, Div Injury Prevent, Beijing, Peoples R China
[3] Chinese Ctr Dis Control & Prevent, Natl Ctr Chron & Noncommunicable Dis Control & Pr, Beijing, Peoples R China
[4] Inner Mongolia Med Univ, Sch Publ Hlth, Hohhot, Inner Mongolia, Peoples R China