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Funding This work was supported by grants from the Bowel Disease Research Foundation (WJ) and the Sheffield Hospitals Charitable Trust (IA, WJ, AS and DG).
Competing interests None.
Patient consent Obtained.
Ethics approval This study was conducted with the approval of the South Humber Research Ethics Committee (REC ref: 07/Q1105/4).
Provenance and peer review Not commissioned; not externally peer reviewed.
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