1. Department of Obstetrics and Gynecology (L.S., S.Y., W.H., Q.W., Y.S.), Chengdu Sichuan 610041, People's Republic of China
2. The Chinese University of Hong Kong Joint Laboratory for Reproductive Medicine (W.X., Y.L.), Key Laboratory of Obstetric, Gynecologic, and Pediatric Diseases and Birth Defects of Ministry of Education, West China Second University Hospital of Sichuan University, Chengdu Sichuan 610041, People's Republic of China