1. Department of Gynecological Endocrinology, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing, China;
2. Department of Women’s Health, University Women’s Hospital and Research Centre of Women’s Health, University Clinicum Centre of Tuebingen, Tuebingen, Germany;
3. Community Reproductive and Sexual Healthcare Unit, Guy’s and St. Thomas’ NHS Foundation Trust, London, UK;
4. Department of Obstetrics and Gynecology, University of the Philippines College of Medicine, Center for Advanced Reproductive Medicine, St. Luke’s Medical Center BGC, Manila, Philippines