[1] Acad Med Ctr, Dept Gastroenterol, NL-1005 AZ Amsterdam, Netherlands
[2] Western Infirm & Associated Hosp, Dept Gastroenterol, Glasgow, Lanark, Scotland
[3] Katholieke Univ Leuven Hosp, Dept Gastroenterol, Louvain, Belgium
[4] Royal Adelaide Hosp, Acad Med Ctr, Dept Gastroenterol, Adelaide, SA, Australia
[5] McMaster Univ, Hlth Sci Ctr, Dept Gastroenterol, Hamilton, ON L8S 4L8, Canada
[6] Univ Magdeburg, Dept Gastroenterol Hepatol & Infect Dis, D-39106 Magdeburg, Germany
[7] Univ Durham, Ctr Integrated Hlth Care Res, Durham, England
[8] Aston Univ, Sch Life Sci, Birmingham B4 7ET, W Midlands, England