Department of Gastroenterology Ajou University School of Medicine Suwon South Korea;
Department of Gastroenterology Ajou University School of Medicine Suwon South Korea;
Department of Gastroenterology Ajou University School of Medicine Suwon South Korea;
Department of Gastroenterology Ajou University School of Medicine Suwon South Korea;
Department of Gastroenterology Ajou University School of Medicine Suwon South Korea;