1. Division of Endocrinology & Metabolism, Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea.
2. Division of Endocrinology & Metabolism, Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea.
3. Division of Endocrinology & Metabolism, Department of Internal Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
4. Division of Endocrinology & Metabolism, Department of Internal Medicine, Yeungnam University College of Medicine, Daegu, Korea.
5. Division of Endocrinology & Metabolism, Department of Internal Medicine, Chonbuk National University Medical School, Jeonju, Korea.
6. Division of Endocrinology & Metabolism, Department of Internal Medicine, Hallym University College of Medicine, Seoul, Korea.
7. Division of Endocrinology & Metabolism, Department of Internal Medicine, Dong-A University College of Medicine, Busan, Korea.
8. Division of Endocrinology & Metabolism, Department of Internal Medicine, Pusan National University College of Medicine, Busan, Korea.
9. Division of Endocrinology & Metabolism, Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
10. Division of Endocrinology & Metabolism, Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea.
11. Division of Endocrinology & Metabolism, Department of Internal Medicine, The Catholic University of Korea, Seoul, Korea.
12. Bayer Korea Ltd., Seoul, Korea.