1 Department of Colorectal Surgery, Wythenshawe Hospital, Manchester University NHS Foundation Trust, 2nd Floor Acute Block, Southmoor Road, Manchester, M23 9LT, UK. alexander.oconnor@mft.nhs.uk.
2 Faculty of Biology, Medicine, and Health, The University of Manchester, Manchester, UK. alexander.oconnor@mft.nhs.uk.
3 Department of Colorectal Surgery, Wythenshawe Hospital, Manchester University NHS Foundation Trust, 2nd Floor Acute Block, Southmoor Road, Manchester, M23 9LT, UK.
4 Faculty of Biology, Medicine, and Health, The University of Manchester, Manchester, UK.