[Liu, Zijing; Yang, Wenhui; Lu, Chan; Liao, Hongsen] Cent South Univ, XiangYa Sch Publ Hlth, Changsha 410078, Hunan, Peoples R China.
[Wang, Faming] Katholieke Univ Leuven, Dept Biosyst, Div Anim & Human Hlth Engn, B-3001 Leuven, Belgium.
[Wang, Faming] Xian Univ Sci & Technol, Occupat Safety & Publ Hlth Grp, Xian 710054, Shanxi, Peoples R China.
[Li, Bin] Cent China Normal Univ, Sch Psychol, Wuhan 430070, Hubei, Peoples R China.