1. Department of Internal Medicine, Dongguk University Ilsan Hospital, Dongguk University College of Medicine, Goyang, Korea
2. Department of Internal Medicine, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul National University College of Medicine, Seoul, Korea
3. Department of Internal Medicine, Center for Cancer Detection and Prevention, National Cancer Center, Goyang, Korea
4. Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, Korea