1. Department of Gastroenterology; Liver Center, Asan Medical Center, University of Ulsan College of Medicine; Seoul Korea
2. Department of Medicine; Samsung Medical Center, Sungkyunkwan University School of Medicine; Seoul Korea
3. Department of Internal Medicine; Korea University College of Medicine; Seoul Korea
4. Department of Internal Medicine and Liver Research Institute; Seoul National University College of Medicine; Seoul Korea
5. Department of Internal Medicine; Konkuk University School of Medicine; Seoul Korea