1. Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Linkou, Taiwan
2. Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital at Linkou and Chang Gung University College of Medicine, Kwei-Shan, Taoyuan, Taiwan
3. Department of Obstetrics and Gynecology, Bhatia General Hospital, Mumbai, Maharashtra, India