1. Division of Cardiology, Department of Internal Medicine, Medical Research Institute, Pusan National University Hospital, Pusan National University School of Medicine, Busan, Korea.
2. Department of Thoracic and Cardiovascular Surgery, Medical Research Institute, Pusan National University Hospital, Pusan National University School of Medicine, Busan, Korea.
3. Department of Anesthesiology, Medical Research Institute, Pusan National University Hospital, Pusan National University School of Medicine, Busan, Korea.