1. Department of Endocrinology and Metabolism, Kyung Hee University School of Medicine, Seoul, Korea.
2. Department of Endocrinology, Yonsei University College of Medicine, Seoul, Korea.
3. Division of Endocrinology, Department of Internal Medicine, Gachon University College of Medicine, Incheon, Korea.
4. Division of Endocrinology and Metabolism, Department of Internal Medicine, National Health Insurance Service Ilsan Hospital, Goyang, Korea.
5. Division of Endocrinology and Metabolism, Department of Medicine, Konkuk University School of Medicine, Seoul, Korea.
6. Department of Internal Medicine, Cheil General Hospital & Women's Healthcare Center, Dankook University College of Medicine, Seoul, Korea.
7. Division of Endocrinology and Metabolism, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.
8. Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea.
9. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
10. Division of Geriatrics, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
11. Division of Endocrinology and Metabolism, Department of Internal Medicine, Research Institute of Clinical Medicine of Chonbuk National University and Biomedical Research Institute of Chonbuk National University Hospital, Jeonju, Korea.
12. Department of Endocrinology and Metabolism, Ajou University School of Medicine, Suwon, Korea.
13. Department of Internal Medicine, Dongguk University College of Medicine, Gyeongju, Korea.
14. Department of Internal Medicine, International St. Mary's Hospital, Catholic Kwandong University College of Medicine, Incheon, Korea.
15. Department of Internal Medicine, Inje University College of Medicine, Busan, Korea.
16. Division of Endocrinology, Department of Internal Medicine, Wonkwang University Sanbon Hospital, Wonkwang University School of Medicine, Gunpo, Korea.
17. Division of Endocrinology and Metabolism, Department of Internal Medicine, Chosun University College of Medicine, Gwangju, Korea.
18. Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea.
19. Division of Endocrinology and Metabolism, Department of Internal Medicine, Sejong General Hospital, Bucheon, Korea.