1. Department of Gynecological Endocrinology, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing Maternal and Child Health Care Hospital, Beijing, China
2. Department of Women’s Health, University Women’s Hospital and Research Centre for Women’s Health, University of Tuebingen, Tuebingen, Germany
3. Department of Gynecology, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing Maternal and Child Health Care Hospital, Beijing, China