1. Department of Internal Medicine, Gyeongsang National University Changwon Hospital, Changwon, Korea.
2. Division of Cardiology, Department of Internal Medicine, Chungnam National University Hospital, Daejeon, Korea.
3. Department of Internal Medicine, Changwon Samsung Medical Center, Changwon, Korea.
4. Division of Cardiology, Department of Internal Medicine, Ulsan University Hospital, Ulsan, Korea.
5. Division of Cardiology, Department of Internal Medicine, Chungbuk National University Hospital, Cheongju, Korea.
6. Division of Cardiology, Department of Internal Medicine, Pusan National University Yangsan Hospital, Yangsan, Korea.
7. Division of Cardiology, Department of Internal Medicine, Kyung Hee University Hospital, Seoul, Korea.
8. Division of Cardiology, Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
9. Division of Cardiology, Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea.
10. Division of Cardiology, Department of Internal Medicine, Chonnam National University Hospital, Gwangju, Korea.
11. Department of Cardiology, Singapore National University Heart Centre, Singapore.
12. Department of Internal Medicine, Gyeongsang National University Hospital, Jinju, Korea.