1. Department of Internal Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
2. Department of Thoracic and Cardiovascular Surgery, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
3. Department of Pathology, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
4. Department of Internal Medicine, Kosin University Gospel Hospital, University of Kosin College of Medicine, Busan, Korea.