1. Division of Endocrinology, Dong-A University College of Medicine, Busan, Korea.
2. Division of Endocrinology and Metabolism, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
3. Division of Cardiology, Korea University College of Medicine, Seoul, Korea.
4. Division of Cardiology, Yonsei University College of Medicine, Seoul, Korea.
5. Department of Internal Medicine, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.