1 Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Linkou, Taoyuan, 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.