1 Academic Department of Gastroenterology, Sheffield Teaching Hospitals NHS Foundation Trust, Royal Hallamshire Hospital, Sheffield, UK. alenka.brooks@sth.nhs.uk.
2 Clinical Psychology Unit, Department of Psychology, University of Sheffield, Sheffield, UK.
3 Molecular Gastroenterology Research Group, Academic Unit of Surgical Oncology, Department of Oncology, The Medical School, Sheffield, UK.
4 Academic Department of Gastroenterology, Sheffield Teaching Hospitals NHS Foundation Trust, Royal Hallamshire Hospital, Sheffield, UK.