1. Department of Gastroenterology, Asan Liver Centre, Seoul, Korea
2. Health Screening and Promotion Centre, Seoul, Korea
3. Department of Clinical Epidemiology and Biostatistics, Asan Medical Centre, University of Ulsan College of Medicine, Seoul, Korea
4. Department of Radiology, Asan Liver Centre, Seoul, Korea
5. Department of Surgery, Asan Liver Centre, Seoul, Korea