作者单位:Department of Gastroenterology, Great Ormond Street Hospital and UCL, London WC1N 3JH, United[1]Department of Digestive Surgery, Hopital Henri Mondor-Université Paris Est, 94010 Creteil, France[2]Gastroenterology and Operative Endoscopy Unit, University of Parma, 43121 Parma, Italy[3]