1. Department of Internal Medicine; Kangbuk Samsung Hospital; Sungkyunkwan University School of Medicine; Seoul Korea
2. Department of Internal Medicine; Asan Medical Center; University of Ulsan College of Medicine; Seoul Korea
3. Department of Surgery; Asan Medical Center; University of Ulsan College of Medicine; Seoul Korea
4. Department of Radiology; Asan Medical Center; University of Ulsan College of Medicine; Seoul Korea
5. Department of Pathology; Asan Medical Center; University of Ulsan College of Medicine; Seoul Korea