1. Assisted Reproduction Unit, Department of Obstetrics and Gynecology, Key Laboratory of Reproductive Dysfunction Management of Zhejiang Province, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Hangzhou, China
2. Department of Obstetrics & Gynecology, the Second Affiliated Hospital, the Chinese University of Hong Kong, Shenzhen, China
3. Department of Obstetrics & Gynecology, the Chinese University of Hong Kong, Hong Kong SAR, China
4. Li Ka Shing Institute of Health Sciences; School of Biomedical Sciences, Hong Kong-Sichuan University Joint Laboratory in Reproductive Medicine, Chinese University of Hong Kong, Hong Kong SAR, China