1. Department of Thoracic & Cardiovascular Surgery, College of Medicine, Pusan National University, Busan, Korea.
2. Department of Pathology, College of Medicine, Pusan National University, Busan, Korea.
3. Medical Research Institute, College of Medicine, Pusan National University, Busan, Korea.
4. Department of Internal Medicine, College of Medicine, Pusan National University, Busan, Korea.
5. Department of Diagnostic Radiology, College of Medicine, Pusan National University, Busan, Korea.