1. Sidney Kimmel Comprehensive Cancer Center; Johns Hopkins University School of Medicine; Baltimore; MD; USA
2. Department of Internal Medicine; University of Ulsan College of Medicine, Asan Medical Center; Seoul; South Korea
3. Department of Pathology; University of Ulsan College of Medicine, Asan Medical Center; Seoul; South Korea
4. Department of Hepatobiliary Surgery; University of Ulsan College of Medicine, Asan Medical Center; Seoul; South Korea