1. Department of Obstetrics and Gynecology, Gangnam Severance Hospital, Yonsei University College of Medicine
2. Department of Pathology and Cancer Research Institute, Chungnam National University College of Medicine
3. Department of Laboratory Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine
4. Department of Obstetrics and Gynecology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine