[Peng Huang; Tan, Hongzhuan; Liu, Aizhong; Chen, Mengshi] Cent S Univ, Sch Publ Hlth, Changsha 410078, Hunan, Peoples R China.
[Peng Huang] Nanchang Univ, Sch Publ Hlth, Nanchang 330006, Jiangxi, Peoples R China.
[Feng, Shuidong] Univ S China, Sch Publ Hlth, Hengyang 421001, Hunan, Peoples R China.
[Tan, Hongzhuan] Cent S Univ, Sch Publ Hlth, Xiangya Rd 110, Changsha 410078, Hunan, Peoples R China.