1. Gynecologic Cancer Center, Department of Obstetrics and Gynecology, CHA University Ilsan Medical Center, Goyang, Korea.
2. Department of Obstetrics and Gynecology, Seoul National University College of Medicine, Seoul, Korea.
3. Department of Pathology, Seoul National University College of Medicine, Seoul, Korea.
4. Department of Pathology, Seoul National University Bundang Hospital, Seongnam, Korea.