1. Department of Obstetrics and Gynecology, Linkou Chang Gung Memorial Hospital, Taoyuan City, Taiwan
2. Department of Obstetrics and Gynecology, Batangas Medical Center, Batangas City, Philippines
3. Department of Obstetrics and Gynecology, Chang Gung University College of Medicine, Taoyuan City, Taiwan
4. Department of Obstetrics and Gynecology, Luis Hora Memorial Regional Hospital, Bauko, Philippines
5. Department of Obstetrics and Gynecology, Nyein Hospital, Mandalay, Myanmar