1. Department of Obstetrics and Gynecology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan.
2. Department of Obstetrics and Gynecology, National Yang-Ming University, Taipei, Taiwan.
3. Institute of Biomedical Sciences, National Sun Yat-Sen University, Kaohsiung, Taiwan.
4. Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Taoyuan, Taiwan.
5. Department of Obstetrics and Gynecology, College of Medicine, Chang Gung University, Taoyuan, Taiwan.
6. Department of Obstetrics and Gynecology, Mackay Memorial Hospital, Taipei, Taiwan.
7. Department of Obstetrics and Gynecology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan.
8. Department of Obstetrics and Gynecology, Taichung Veterans General Hospital, Taichung, Taiwan.
9. Division of Gynecology, Department of Obstetrics and Gynecology, Taipei Veterans General Hospital, Taipei, Taiwan.
10. Department of Obstetrics and Gynecology, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan.
11. Department of Obstetrics and Gynecology, College of Medicine, National Taiwan University, Taipei, Taiwan.
12. Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan.
13. Department of Obstetrics and Gynecology, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan.
14. Department of Medicine, Mackay Medical College, New Taipei City, Taiwan.