1 Institute of Nuclear Medicine, University College London (UCL), London, UK.
2 Department of Nuclear Medicine, Keelung Chang Gung Memorial Hospital, Keelung, Taiwan.
3 Centre for Medical Imaging, University College London, London, UK.
4 Surgery and Cancer Board, Imaging Division, University College London Hospitals (UCLH) NHS Foundation Trust, University College Hospital (UCH), London, UK.
5 Department of Research Pathology, Cancer Institute, UCL, London, UK.
6 University of Iowa, Carver College of Medicine, Iowa City, USA.
7 Institute of Health Barts and London Medical School, Queen Mary University of London (QMUL), London, UK.
8 Division of Cancer and Clinical Support, Barking, Havering and Redbridge University Hospitals NHS Trust, Queens and King George Hospitals, Essex, UK.
9 Radiotherapy Department, Barts Cancer Centre, St Bartholomew's Hospital, West Smithfield, London, UK.
10 Department of Colorectal Surgery, Barnet and Chase Farm Hospitals, Royal Free London NHS Foundation Trust, London, UK.
11 Department of Lower GI Surgery and Coloproctology, Mid Essex Hospital Services NHS Trust, Broomfield Hospital, Essex, UK.
12 Department of Surgery & Department of Clinical Oncology, East Suffolk and North Essex NHS Foundation Trust, Colchester General Hospital, Essex, UK.
13 Barts Health NHS Trust, Cancer Clinical Board, Colorectal Surgery, Whipps Cross Hospital, London, UK.
14 East and North Hertfordshire NHS Trust, Colorectal Surgery, Queen Elizabeth II Hospital, Hertfordshire, UK.
15 East and North Hertfordshire NHS Trust, Colorectal Surgery, Lister Hospital, Hertfordshire, UK.
16 School of Cancer & Pharmaceutical Sciences, Kings College London (KCL), London, UK. tony.ng@kcl.ac.uk.
17 Institute of Nuclear Medicine, University College London (UCL), London, UK. a.groves@ucl.ac.uk.