1. University Hospitals Bristol NHS Foundation Trust and the University of Bristol; NIHR Bristol Biomedical Research Centre; Education and Research Centre, Upper Maudlin Street Bristol Avon UK BS2 8AE
2. Bispebjerg Hospital, Building 39N; The Cochrane Colorectal Cancer Group; 23 Bispebjerg Bakke Copenhagen Denmark DK 2400 CPH NV
3. Derriford Hospital; Department of Gastroenterology; Derriford Road Plymouth Devon UK PL6 8DH
4. University Hospitals Bristol NHS Trust; Head & Neck Surgery; Marlborough Street Bristol UK BS1 3NU