1. Division of Cardiology, Department of Internal Medicine, College of Medicine, Seoul National University and Cardiovascular Center, Seoul National University Bundang Hospital, Seongnam, Korea.
2. Department of Radiology, Seoul National University Bundang Hospital, Seongnam, Korea.
3. Department of Internal Medicine, Boramae Medical Center, Seoul, Korea.
4. Division of Cardiology, Department of Internal Medicine, Inha University Hospital, Incheon, Korea.
5. Department of Internal Medicine and Cardiovascular Research Institute, Keimyung University Dongsan Hospital, Daegu, Korea.
6. Division of Cardiology, Department of Internal Medicine, Ewha Woman's University School of Medicine, Seoul, Korea.
7. Inje University Ilsan Paik Hospital, Goyang, Korea.
8. Division of Cardiology, Department of Internal Medicine, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea.
9. Department of Internal Medicine, College of Medicine, Chungbuk National University, Cheongju, Korea.