[1] Univ Bristol, Dept Gastroenterol, Bristol, Avon, England
[2] Translat Res Ctr Gastrointestinal Disorders, Dept Gastroenterol, Louvain, Belgium
[3] Univ Calgary, Dept Gastroenterol, Calgary, AB, Canada
[4] Univ W England, Dept Dept Sensors & Technol, Bristol BS16 1QY, Avon, England
[5] Univ Liverpool, Dept Gastroenterol, Liverpool L69 3BX, Merseyside, England