1. Department of Thoracic and Cardiovascular Surgery, Seoul National University Hospital, Seoul, Seoul National University College of Medicine , Seoul, South Korea
2. Interdiscplinary Program in Bioengineering, Seoul National University Graduate School , Seoul, South Korea
3. Department of Thoracic and Cardiovascular Surgery, Sejong General Hospital , Bucheon, South Korea
4. Department of Biomedical Engineering, Seoul National University College of Medicine, and Institute of Medical and Biological Engineering, Medical Research Center, Seoul National University , Seoul, South Korea