Affiliation: | 1. Department of Thoracic and Cardiovascular Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea;2. Division of Cardiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea;3. Department of Thoracic and Cardiovascular Surgery, Pusan National University Yangsan Hospital, Busan, South Korea |