1. Division of Rheumatology, Department of Internal Medicine, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Korea.
2. Department of Plastic Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
3. Division of Acute Care Surgery, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
4. Department of Thoracic and Cardiovascular Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
5. Department of Medical Education, University of Ulsan College of Medicine, Seoul, Korea.