National Clinical Research Center for Obstetric & Gynecologic Diseases, National Clinical Research Center for Obstetric & Gynecologic Diseases, Zhangjiagang First People's Hospital, Jiangxi Maternal and Child Health Hospital, Dalian University, Henan University, Government of the People's Republic of China - Cangzhou People's Hospital, Zhengzhou University - Zhengzhou Central Hospital, Hainan Women and Children's Medical Center, Chengdu Medical College, Liaocheng People's Hospital, University of Electronic Science and Technology of China (UESTC) - Chengdu Women’s and Children’s Central Hospital, Jiangsu Province Hospital of Chinese Medicine, Tianjin Nankai Hospital, Chongqing Health Center for Women and Children, Hebei Medical University - Department of Obstetrics and Gynecology, Maternal and Child Health Hospital of Gansu Province, Taizhou People’s Hospital, Central South University, Capital Medical University - Department of Neurosurgery and National Clinical Research Center for Obstetric & Gynecologic Diseases