1. Department of Internal Medicine, Cheil General Hospital, Kwandong University College of Medicine, Seoul, Korea.
2. Department of Internal Medicine and Laboratory of Molecular Endocrinology, Gachon University School of Medicine, Incheon, Korea.
3. Department of Medical Genetics, Ajou University School of Medicine, Suwon, Korea.
4. Department of Endocrinology and Metaboilism, Ajou University School of Medicine, Suwon, Korea.
5. Department of Internal Medicine, Gyeongsang Institute of Health Science, Gyeongsang National University School of Medicine, Jinju, Korea.