1. Department of Obstetrics and Gynecology, Seoul National University Hospital, Seoul, Republic of Korea.
2. Department of Pediatrics, Seoul National University College of Medicine, Seoul National University Children's Hospital, Seoul, Republic of Korea.
3. Seoul National University Cancer Research Institute, Seoul, Republic of Korea.
4. Department of Pediatrics, Seoul National University Children's Hospital, Seoul, Republic of Korea.
5. Departments of Obstetrics and Gynecology, Seoul National University College of Medicine, Seoul, Republic of Korea.
6. Institute of Reproductive Medicine and Population, Medical Research Center, Seoul National University, Seoul, Republic of Korea.