Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, Korea.

Department of Internal Medicine, Division of Gastroenterology, Seoul National University Bundang Hospital, Seongnam, Korea.

Department of Biomedicine & Health Sciences, College of Medicine, Catholic University of Korea, Seoul, Korea.

Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, Korea.

Department of Internal Medicine, Division of Gastroenterology, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul, Korea.

Department of Internal Medicine, Chung-ang University College of Medicine, Seoul, Korea.

Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, Korea.

Department of Internal Medicine, Division of Gastroenterology, Seoul National University Hospital, Seoul, Korea.

Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, Korea.

Department of Internal Medicine, Division of Gastroenterology, Seoul National University Hospital, Seoul, Korea.

Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, Korea.

Department of Internal Medicine, Division of Gastroenterology, Seoul National University Hospital, Seoul, Korea.

Department of Statistics and Actuarial Science, Soongsil University, Seoul, Korea.

Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, Korea.

Department of Internal Medicine, Division of Gastroenterology, Seoul National University Hospital, Seoul, Korea.