1. Department of Obstetrics & Gynaecology The University of Hong Kong Hong Kong SAR China
2. Department of Obstetrics and Gynaecology, Shenzhen Key Laboratory of Fertility Regulation The University of Hong Kong‐Shenzhen Hospital Shenzhen China
3. Department of Obstetrics and Gynecology, Reproductive Medicine Center Zhongnan Hospital of Wuhan University Wuhan China