1. Division of Cardiology, Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
2. Division of Cardiology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
3. Division of Cardiology, Department of Internal Medicine, Dongsan Hospital, Keimyung University School of Medicine, Daegu, Korea.
4. Division of Cardiology, Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea.
5. Division of Cardiology, Department of Internal Medicine, Daegu Catholic University Medical Center, Daegu, Korea.
6. Division of Cardiology, Department of Internal Medicine, Pusan National University Hospital, Busan, Korea.
7. Division of Cardiology, Department of Internal Medicine, Soonchunhyang University Hospital, Seoul, Korea.
8. Division of Cardiology, Department of Internal Medicine, Dong-A University Hospital, Busan, Korea.
9. Division of Cardiology, Department of Internal Medicine, The Catholic University of Korea, ST. Vincent’s Hospital, Suwon, Korea.
10. Division of Cardiology, Department of Internal Medicine, Pusan National University Yangsan Hospital, Yangsan, Korea.
11. Division of Cardiology, Department of Internal Medicine, Dongguk University Ilsan Hospital, Goyang, Korea.