1. Department of Obstetrics and Gynecology, Faculty of Medicine, Juntendo University, Tokyo, Japan.
2. Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital at Linkou and Chang Gung University College of Medicine, Kweishan, Taoyuan, Taiwan.
3. Department of Obstetrics and Gynecology, University of Perpetual Help Las Pinas and De La Salle University Medical Center, Cavite, Philippines.