1. Division of Cardiology, Daejeon St. Mary's Hospital, College of Medicine The Catholic University of Korea Daejeon South Korea
2. Division of Cardiology, Department of Internal Medicine, Asan Medical Center University of Ulsan College of Medicine Seoul South Korea
3. Division of Cardiology, Department of Internal Medicine, Eunpyeong St. Mary's Hospital College of Medicine The Catholic University of Korea Seoul South Korea
4. Division of Cardiology, Chungnam National University Hospital Chungnam National University School of Medicine Daejeon South Korea
5. Division of Cardiology, Department of Medicine, Kangbuk Samsung Hospital Sungkyunkwan University School of Medicine Seoul South Korea