1. Division of Gastroenterology and Hepatology, Department of Internal Medicine; Ilsan Paik Hospital, Inje University College of Medicine; Goyang South Korea
2. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine; Ilsan Paik Hospital, Inje University College of Medicine; Goyang South Korea
3. Department of Pathology; Ilsan Paik Hospital, Inje University College of Medicine; Goyang South Korea