1. Department of Obstetrics and Gynecology, Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.
2. Paik Institute for Clinical Research, Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.
3. Department of Pathology, Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.