1. Department of Surgery, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
2. Department of Internal Medicine, Hallym University Dongtan Sacred Heart Hospital, Hwaseong, Korea.
3. Department of Internal Medicine, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
4. Department of Pathology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.