[1] Univ Nottingham Hosp, Queens Med Ctr, NIHR Biomed Res Unit, Nottingham Digest Dis Ctr,Div Gastrointestinal Su, Nottingham NG7 2UH, England
[2] Univ Nottingham Hosp, Queens Med Ctr, NIHR Biomed Res Unit, Nottingham Digest Dis Ctr,Dept Cellular Pathol, Nottingham NG7 2UH, England
[3] Univ Nottingham Hosp, Queens Med Ctr, NIHR Biomed Res Unit, Nottingham Digest Dis Ctr,Dept Radiol, Nottingham NG7 2UH, England