Kuan-Hao Tsui1, Ben-Shian Huang2, Peng-Hui Wang3. 1. Department of Obstetrics and Gynecology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan, ROC; Department of Obstetrics and Gynecology, National Yang-Ming University, Taipei, Taiwan, ROC; Department of Pharmacy and Graduate Institute of Pharmaceutical Technology, Tajen University, Pingtung, Taiwan, ROC. 2. Department of Obstetrics and Gynecology, National Yang-Ming University Hospital, Ilan, Taiwan, ROC; Department of Obstetrics and Gynecology, National Yang-Ming University, Taipei, Taiwan, ROC. 3. Department of Obstetrics and Gynecology, Taipei Veterans General Hospital, Taipei, Taiwan, ROC; Department of Obstetrics and Gynecology, National Yang-Ming University, Taipei, Taiwan, ROC. Electronic address: phwang@vghtpe.gov.tw.