1. Division of Cardiology, Department of Internal Medicine and Catholic Research Institute for Intractable Cardiovascular Disease, College of Medicine, The Catholic University of Korea, Seoul, Korea.
2. Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
3. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
4. Heartwell Clinic, Seoul, Korea.
5. Seoul One Internal Medicine, Uijeongbu, Korea.
6. Cardiovascular Center, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea.
7. Division of Cardiology, Department of Internal Medicine, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul National University College of Medicine, Seoul, Korea.
8. Division of Cardiology, Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea.