1. Department of Pediatrics, Chonnam National University Medical School, Gwangju, Korea.
2. Department of Obstetrics and Gynecology, Chonnam National University Medical School, Gwangju, Korea.
3. Department of Pathology, Chonnam National University Medical School, Gwangju, Korea.
4. Department of Radiology, Chonnam National University Medical School, Gwangju, Korea.