Affiliation: | 1. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Gojan-dong, Danwon-gu, Ansan-si, Gyeonggi-do, 425-707, Korea 2. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Korea University Anam Hospital, Korea University College of Medicine, Anam-dong, Seongbuk-gu, Seoul, 425-707, Korea 3. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Korea University Guro Hospital, Korea University College of Medicine, Gurodong-gil, Guro-gu, Seoul, 425-707, Korea
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