title: Response.
authors.affiliation: Division of Gastroenterology, Department of Internal Medicine, Korea University College of Medicine, Guro Hospital, Seoul, Republic of Korea.
authors.forename: Moon Kyung
authors.initials: MK
authors.lastname: Joo
authors.affiliation: Division of Gastroenterology, Department of Internal Medicine, Korea University College of Medicine, Guro Hospital, Seoul, Republic of Korea.
authors.forename: Jong-Jae
authors.initials: JJ
authors.lastname: Park