1. Department of Endocrinology and Metabolism, Ajou University School of Medicine, Suwon, Korea.
2. Division of Endocrinology and Metabolism, Department of Internal Medicine, The Catholic University of Korea College of Medicine, Seoul, Korea.
3. Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
4. Division of Endocrinology and Metabolism, Department of Internal Medicine, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea.
5. Division of Endocrinology and Metabolism, Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea.
6. Department of Internal Medicine, Mitochondrial Research Group, Inje University Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea.
7. Division of Endocrinology and Metabolism, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
8. Department of Internal Medicine, Konkuk University School of Medicine, Seoul, Korea.