1. Department of Obstetrics and Gynecology, Shin Kong Wu Ho-Su Memorial Hospital, Taipei, Taiwan, ROC
2. School of Medicine, Fu-Jen Catholic University, New Taipei City, Taiwan, ROC
3. Department of Obstetrics and Gynecology, National Taiwan University Hospital, Taipei, Taiwan, ROC
4. Department of Obstetrics and Gynecology, Taipei Medical University, Taipei, Taiwan, ROC