1 Department of Obstetrics and Gynecology, Nyein Hospital, Mandalay, Myanmar.
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, Batangas Medical Center, Philippines.
4 Department of Obstetrics and Gynecology, Luis Hora Memorial Regional Hospital, Philippines.