1 National Bowel Research Centre and GI Physiology Unit, Centre for Neuroscience, Surgery & Trauma, Blizard Institute, Queen Mary University of London, London, United Kingdom.
2 Department of Gastroenterology and Hepatology, Amsterdam University Medical Center, Amsterdam, the Netherlands.
3 Amsterdam Gastroenterology Endocrinology Metabolism Research Institute, Amsterdam, The Netherlands.
4 Department of Surgery, Oncology and Gastroenterology-DISCOG, University of Padua, Padua, Italy .