1. Department of General Surgery, University Hospital of Wales, Cardiff and Vale University Health Board, Cardiff CF14 4XW, UK
2. Western General Hospital, NHS Lothian, Crewe Road South, Edinburgh EH4 2XU, UK
3. Department of Electrical and Computer Engineering, Northwestern University, 633 Clark St, Evanston, IL 60208, USA
4. Cardiff Transplant Unit, University Hospital of Wales, Cardiff and Vale University Health Board, Cardiff CF14 4XW, UK
5. Urology Department, General Hospital of Thessaloniki “G. Gennimata-Agios Dimitrios”, Elenis Zografou 2, 54634 Thessaloniki, Greece
6. Department of General Surgery, North Hampshire NHS Foundation Trust, Basingstoke RG24 9NA, UK
7. Department of General Surgery, Grange University Hospital, Caerleon Road, Llanfrechfa, Cwmbran NP44 8YN, UK
8. Department of Surgery Larnaca General Hospital Pandoras, 6301 Larnaca, Cyprus
9. Second Surgical Propedeutic Department, School of Medicine, Ippokrateio General Hospital, Aristotle University of Thessaloniki, Konstantinoupoleos 49, 54642 Thessaloniki, Greece