1. Department of Internal Medicine, Incheon Christian Hospital, Incheon, Korea.
2. Department of Endocrinology and Metabolism, Kyung Hee University School of Medicine, Seoul, Korea.
3. Research Institute of Endocrinology, Kyung Hee University, Seoul, Korea.
4. Department of Internal Medicine, Dongsuwon Hospital, Suwon, Korea.
5. Medical Genetics Clinic and Laboratory, Asan Medical Center, Seoul, Korea.
6. Department of Pediatrics, University of Ulsan College of Medicine, Seoul, Korea.
7. Department of Gastroenterology and Hepatology, Kyung Hee University School of Medicine, Seoul, Korea.