1. Singleton Hospital, ABM University NHS Trust; Department of Colorectal Surgery; Sketty Lane Swansea UK SA2 8QA
2. Wrexham Maelor Hospital, BCUHB; Department of General Surgery; Croesnewydd Rd Wrexham UK LL13 7TD
3. NHS Greater Glasgow and Clyde; Department of Urology; Queen Elizabeth University Hospital Glasgow Scotland UK
4. Royal Gwent Hospital; Department of General Surgery; Newport Wales UK
5. King's College London; Institute of Psychiatry, Psychology & Neuroscience; Biostatistics and Health Informatics; Denmark Hill London UK