[Zhou, Yan; Guo, Wei-Zhen; Zou, Xue-Min] Changsha Med Univ, Sch Publ Hlth, Changsha, Hunan, Peoples R China.
[Fu, Xiao-Ming] Hunan Normal Univ, Xiangnan Affiliated Hosp, Hosp Peoples Liberat Army 169, Hengyang, Hunan, Peoples R China.
[Wu, Cheng-Qiu; He, Dong-Liang] Univ South China, Sch Publ Hlth, Dept Prevent Med, Hengyang, Hunan, Peoples R China.
[He, Dong-Liang] Huazhong Univ Sci & Technol, Tongji Med Coll, Sch Publ Hlth, Dept Nutr & Food Hyg, Wuhan, Hubei, Peoples R China.
[Feng, Wei] Huazhong Univ Sci & Technol, Tongji Med Coll, Sch Publ Hlth, Dept Occupat & Environm Hlth, Wuhan, Hubei, Peoples R China.