Institution: | 1. Department of Obstetrics, Xiangya Hospital Central South University, Changsha China ; 2. Department of Obstetrics and Gynecology, Wuhan Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan China ; 3. Department of Obstetrics and Gynecology, Changsha Hospital for Maternal and Child Health Care, Changsha China ; 4. Hunan Engineering Research Center of Early Life Development and Disease Prevention, Changsha China |