[1] Univ York, Dept Hlth Sci, York YO10 5DD, N Yorkshire, England
[2] Univ S Australia, Sch Nursing & Midwifery, Adelaide, SA 5001, Australia
[3] Univ Adelaide, Sch Psychol, Adelaide, SA, Australia
[4] Royal Adelaide Hosp, Dept Gastroenterol & Hepatol, IBD Serv, Adelaide, SA 5000, Australia
[5] Univ Adelaide, Sch Med, Adelaide, SA, Australia
[6] Univ London, Barts & London Sch Med & Dent, Ctr Digest Dis, London, England
[7] Royal Free London NHS Fdn Trust, London, England
[8] Erasmus MC, Dept Gastroenterol & Hepatol, Rotterdam, Netherlands
[9] Univ Manitoba, Inflammatory Bowel Dis Clin & Res Ctr, Winnipeg, MB, Canada
[10] Univ Manitoba, Dept Internal Med, Winnipeg, MB, Canada