1. Division of Cardiology, Severance Cardiovascular Hospital and Cardiovascular Research Institute, Yonsei University College of Medicine, Seoul, Korea.
2. Cardiovascular Center and Cardiology Division, Incheon St. Mary's Hospital, The Catholic University of Korea, Incheon, Korea.
3. Department of Biostatistics, Yonsei University College of Medicine, Seoul, Korea.
4. Heart Failure and Cardiac Transplantation Center, Asan Medical Center Heart Institute, University of Ulsan College of Medicine, Seoul, Korea.
5. Cardiovascular Center and Cardiology Division, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
6. Cardiovascular Center and Cardiovascular Research Institute, Seoul National University College of Medicine, Seoul, Korea.
7. Cardiovascular Center and Cardiology Division, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul, Korea.
8. Division of Cardiovascular and Rare Diseases, Center for Biomedical Sciences, Korea National Institute of Health, Cheongwon, Korea.
9. Regional Cardiovascular Disease Center, Division of Cardiology, Department of Internal Medicine, Chungbuk National University Hospital, Cheongju, Korea.