1. Department of Endocrinology and Metabolism, Ajou University School of Medicine, Suwon, Korea.
2. Cardiovascular and Metabolic Disease Etiology Research Center, Ajou University School of Medicine, Suwon, Korea.
3. Department of Endocrinology and Metabolism, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
4. Department of Endocrinology and Metabolism, Kyung Hee University School of Medicine, Seoul, Korea.
5. Department of Internal Medicine, Chungnam National University School of Medicine, Daejeon, Korea.
6. Department of Endocrinology and Metabolism, Chosun University Hospital, Chosun University College of Medicine, Gwangju, Korea.
7. Department of Endocrinology and Metabolism, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Korea.
8. Department of Endocrinology and Metabolism, Yeungnam University College of Medicine, Daegu, Korea.
9. Department of Endocrinology and Metabolism, Pusan National University Hospital, Pusan National University School of Medicine, Busan, Korea.
10. Division of Endocrinology and Metabolism, Department of Internal Medicine, Bucheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Bucheon, Korea.