Affiliation: | 1. Department of Obstetrics and Gynecology, Taiwan Adventist Hospital, Taipei, Taiwan Department of Obstetrics and Gynecology, National Taiwan University Hospital, Taipei, Taiwan;2. Department of Obstetrics and Gynecology, National Taipei College of Nursing Hospital, Taipei, Taiwan;3. Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Taipei, Taiwan;4. Department of Obstetrics and Gynecology, National Taiwan University Hospital, Taipei, Taiwan |