1 Department of Colorectal Surgery, West Middlesex University Hospital, Chelsea and Westminster NHS Foundation Trust, Twickenham Road, Isleworth, TW7 6AF, UK; Department of Metabolism, Digestion and Reproduction, Faculty of Medicine, Imperial College London, London, SW7 2AZ, UK.
2 Department of Colorectal Surgery, West Middlesex University Hospital, Chelsea and Westminster NHS Foundation Trust, Twickenham Road, Isleworth, TW7 6AF, UK.
3 Department of Colorectal Surgery, West Middlesex University Hospital, Chelsea and Westminster NHS Foundation Trust, Twickenham Road, Isleworth, TW7 6AF, UK. Electronic address: nikhil.pawa@chelwest.nhs.uk.