title: Reply to Zhang et al.
authors.affiliation: Division of Gastroenterology, Johns Hopkins Hospital, Baltimore, Maryland, United States.
authors.forename: Saowanee
authors.initials: S
authors.lastname: Ngamruengphong
authors.affiliation: Division of Gastroenterology, Johns Hopkins Hospital, Baltimore, Maryland, United States.
authors.forename: Mouen A
authors.initials: MA
authors.lastname: Khashab