Chapman Thomas P, Chen Lucia Y, Leaver Laurence
Translational Gastroenterology Unit, University of Oxford, John Radcliffe Hospital, Oxford OX3 9DU, UK
Maidstone Hospital, Maidstone and Tunbridge Wells NHS Trust, Maidstone, UK.
BMJ. 2015 Feb 25;350:h573. doi: 10.1136/bmj.h573.