Ling-Yu Jiang1,2, Peng-Hui Wang1,2,3,4. 1. Department of Obstetrics and Gynecology, Taipei Veterans General Hospital, Taipei, Taiwan, ROC. 2. Department of Obstetrics and Gynecology, National Yang-Ming University, Taipei, Taiwan, ROC. 3. Institute of Clinical Medicine, National Yang-Ming University, Taipei, Taiwan, ROC. 4. Department of Medical Research, China Medical University Hospital, Taichung, Taiwan, ROC.