title: Reply.
authors.affiliation: Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Hong Kong.|State Key Laboratory of Digestive Disease, The Chinese University of Hong Kong, Hong Kong.
authors.forename: Vincent Wai-Sun
authors.initials: VW
authors.lastname: Wong
authors.affiliation: Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Hong Kong.|State Key Laboratory of Digestive Disease, The Chinese University of Hong Kong, Hong Kong.
authors.forename: Grace Lai-Hung
authors.initials: GL
authors.lastname: Wong
authors.affiliation: Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Hong Kong.|State Key Laboratory of Digestive Disease, The Chinese University of Hong Kong, Hong Kong.
authors.forename: Henry Lik-Yuen
authors.initials: HL
authors.lastname: Chan