1. Department of Thoracic and Cardiovascular Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
2. Thoracic and Cardiovascular Surgery, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Korea
3. Heart Institute, Asan Medical Center, University of Ulsan 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