1. Division of Endocrinology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
2. Cardiovascular Medicine, Hokko Memorial Clinic, Sapporo, Japan.
3. Division of Endocrinology, Diabetes and Nutrition, Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland.
4. Department of Cardiology, Gachon University Gil Medical Center, Incheon, Korea.