Y-A Tu1, W-C Lin2, H-J Chen2, J-C Shih1. 1. Department of Obstetrics and Gynecology, National Taiwan University Hospital and National Taiwan University College of Medicine, 15F, No. 8, Chung-Shan South Road, 10002, Taipei, Taiwan. 2. Department of Pathology, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan.