1. Department of Surgery, Manchester University Foundation Trust, Manchester, UK
2. Centre of Biomedicine Manchester Metropolitan University, Manchester, UK
3. Fortius Clinic, London, UK
4. Department of Surgery, Institution for Clinical Science, Lund University, Skåne University Hospital, Malmö, Sweden
5. Department of General Surgery, GRN-Klinik Sinsheim, Heidelberg University Hospital, Heidelberg, Germany
6. Department of Surgery, Mikkeli Central Hospital, Mikkeli, Finland
7. Department of Gastrointestinal Surgery, Kuopio University Hospital, Kuopio, Finland
8. School of Medicine, Faculty of Health Sciences, University of Eastern Finland, Kuopio, Finland