1 Department of Obstetrics and Gynecology, Taipei Veterans General Hospital, Taipei, Taiwan, ROC; Department of Obstetrics and Gynecology, National Yang-Ming University School of Medicine, Taipei, Taiwan, ROC; Department of Medical Research, China Medical University Hospital, Taichung, Taiwan, ROC. Electronic address: phwang@vghtpe.gov.tw.
2 Department of Obstetrics and Gynecology, National Yang-Ming University School of Medicine, Taipei, Taiwan, ROC; Department of Obstetrics and Gynecology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan, ROC.
3 Department of Surgery, Taipei Veterans General Hospital, Taipei, Taiwan, ROC; Department of Surgery, National Yang-Ming University School of Medicine, Taipei, Taiwan, ROC.