Peking University - Center for Reproductive Medicine, Peking University - Center for Reproductive Medicine, Guangzhou Medical University - Guangzhou Institute of Pediatrics, Peking University - Department of Reproductive Medicine, Shanghai Jiao Tong University (SJTU) - Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Kunming University of Science and Technology - Department of Reproductive Medicine, Huazhong University of Science and Technology - Center of Reproductive Medicine, Children’s Hospital of Shanxi and Women Health Center of Shanxi - Center of Reproductive Medicine, Zhengzhou University - Reproductive Medical Center, Fujian Medical University - Reproductive Medicine Center, China Medical University - Center of Reproductive Medicine, Hebei Medical University - Department of Reproductive Medicine, Sichuan University - Division of Reproductive Medical Center, Peking University - Center for Reproductive Medicine, Peking University - Center for Reproductive Medicine, Peking University - Center for Reproductive Medicine, Peking University - Center for Reproductive Medicine, University of Adelaide - Discipline of Obstetrics and Gynecology, Peking University - Department of Respiratory and Critical Care Medicine, Peking University - Center for Reproductive Medicine and Peking University - Center for Reproductive Medicine