Institution: | 1. Department of Internal Medicine, Catholic University of Daegu School of Medicine, Daegu, Korea;2. Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea;3. Department of Gastroenterology and Hepatology, Soonchunhyang University School of Medicine, Bucheon, Korea;4. Department of Internal Medicine, Korea University Ansan Hospital, Ansan, Korea;5. Department of Internal Medicine, Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, Korea |