1. Department of Obstetrics and Gynecology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
2. Department of Obstetrics and Gynecology, Hallym University Sacred Heart Hospital, Anyang, Korea.
3. Department of Pathology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
4. Department of Obstetrics and Gynecology, Women’s Cancer Center, Yonsei Cancer Center, Yonsei University College of Medicine, Seoul, Korea.