1. Department of Endocrinology and Metabolism, Ajou University School of Medicine, Suwon, Korea.
2. Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
3. Department of Pediatrics, Ajou University School of Medicine, Suwon, Korea.
4. Dr. Cho's Internal Medicine Clinic, Seoul, Korea.