[Zhang, Hongping; Zhao, Yinshaung] Wuhan Polytech Univ, Coll Med & Hlth Sci, Wuhan 430023, Peoples R China.
[Han, Mo; Wei, Feng] Ctr Dis Prevent & Control Huangpi Dist Wuhan, Wuhan 430300, Peoples R China.
[Chen, Jianquan] Dept Dis Control Hlth & Family Planning Commiss H, Wuhan 430300, Peoples R China.
[Peng, Songxu] Cent South Univ, Xiangya Sch Publ Hlth, Xiangya Sch Med, Dept Maternal & Child Hlth, Changsha 410008, Peoples R China.
[Du, Yukai] Huazhong Univ Sci & Technol, Tongji Med Coll, Sch Publ Hlth, Dept Social Med & Hlth Management, Wuhan 430030, Peoples R China.