1. Health Screening and Promotion Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
2. Department of Internal Medicine, Gachon University Gil Medical Center, Gachon University College of Medicine, Incheon, Korea
3. Department of Radiology, Seoul National University Hospital, Seoul, Korea
4. Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea
5. Center for Liver Cancer, National Cancer Center, Goyang, Korea