1. Division of Cardiology, Korea University College of Medicine and Korea University Medical Center, Seoul, Korea.
2. Department of Internal Medicine, Gachon University Gil Medical Center, Gachon University College of Medicine, Incheon, Korea.
3. Department of Internal Medicine, Chungnam National University Hospital, Chungnam National University College of Medicine, Daejeon, Korea.
4. Department of Internal Medicine, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
5. Department of Internal Medicine, Wonkwang University Hospital, Wonkwang University School of Medicine, Iksan, Korea.
6. Department of Internal Medicine, Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea.
7. Department of Internal Medicine, Heart Vascular and Stroke Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
8. Department of Cardiology, Chonnam National University Hospital, Chonnam National University School of Medicine, Gwangju, Korea.
9. Department of Cardiology, Ajou University School of Medicine, Suwon, Korea.
10. Department of Internal Medicine, Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.
11. Department of Internal Medicine, Keimyung University Dongsan Medical Center, Keimyung University College of Medicine, Daegu, Korea.
12. Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea.
13. Department of Internal Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.