1. Department of Obstetrics and Gynecology, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan
2. Department of Obstetrics and Gynecology, Tri-Service General Hospital Songshan branch, National Defense Medical Center Taipei, Taiwan
3. Department of Obstetrics and Gynecology, Taipei Veterans General Hospital, Taipei, Taiwan, ROC
4. Institute of Biology and Anatomy, National Defense Medical Center, Taipei, Taiwan
5. Graduate Institute of Medical Sciences, National Defense Medical Center, Taipei, Taiwan