1. Department of General and Upper GI Surgery, Barnsley District General Hospital NHS Trust, South Yorkshire, United Kingdom.
2. Department of General and Colorectal Surgery, Royal Oldham Hospital, Lancashire, United Kingdom.
3. Department of Colorectal Surgery, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, South Yorkshire, United Kingdom.
4. Department of General and Colorectal Surgery, Mid Yorkshire Hospitals NHS Trust, Wakefield, West Yorkshire, United Kingdom.
5. Department of General Surgery, Hull University Teaching Hospitals NHS Trust, East Yorkshire, United Kingdom.