1. Department of Obstetrics and Gynaecology, Hankook General Hospital, Jeju, Korea
2. Laboratory of Medical Genetics, Cheil General Hospital and Women’s Healthcare Center, Dankook University College of Medicine, Seoul, Korea
3. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynaecology, Cheil General Hospital and Women’s Healthcare Center, Dankook University College of Medicine, Seoul, Korea
4. Department of Pediatrics, Cheil General Hospital and Women’s Healthcare Center, Dankook University College of Medicine, Seoul, Korea