Author J. Blackwell C. Alexakis S. Saxena H. Creese A. Bottle I. Petersen M. Hotopf R. Pollok Year of Publication 2021 DOI 10.1136/bmjgast-2020-000588 Google ScholarDOIBibTeXEndNote X3 XMLEndNote 7 XMLEndnote taggedMarcRIS