1 Department of Gastroenterology, The Hillingdon Hospital, Uxbridge, UK.
2 Department of Gastroenterology, University Hospitals Coventry and Warwickshire NHS Trust, Coventry, Coventry, UK.
3 Division of Gastroenterology and Hepatology, University of Calgary, Calgary, Alberta, Canada.
4 Department of Gastroentreology, Nottingham University Hospitals NHS Trust and University Hospitals of Derby and Burton NHS Foundation Trust, East Midlands, UK.
5 Faculty of Science & Engineering, University of Wolverhampton, Wolverhampton, UK.
6 Department of Gastroenterology, University Hospitals Coventry and Warwickshire NHS Trust, Coventry, UK.
7 Warwick Medical School, University of Warwick, Coventry, UK.
8 Health, Biological & Experimental Sciences, University of Coventry, Coventry, UK.
9 School of Health Sciences, University of Leicester, Leicester, UK.