1. Hepatobiliary Surgery and Liver Transplantation, Department of Surgery; University of Ulsan College of Medicine; 388-1 Pungnab2-dong, Songpa-gu Seoul 138-736 Korea
2. Department of Gastroenterology, Asan Medical Center; University of Ulsan College of Medicine; Seoul Korea
3. Department of Radiology, Asan Medical Center; University of Ulsan College of Medicine; Seoul Korea