Hsin-Yi Hsu1, Chin-Ru Ker1, Cheng-Yu Long2,3. 1. Department of Obstetrics and Gynecology, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan. 2. Department of Obstetrics and Gynecology, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan. urolong@yahoo.com.tw. 3. Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan. urolong@yahoo.com.tw.