1. Department of Surgery, Zealand University Hospital, Koege, Denmark
2. Department of Surgery, Lund University, Skåne University Hospital, Malmö, Sweden
3. Erasmus University Medical Centre, Rotterdam, the Netherlands
4. Tergooi, Hilversum, the Netherlands
5. Department of General and Hepatopancreatobiliary Surgery, Ghent University Hospital, Ghent, Belgium
6. Third Department of Surgery at Motol University Hospital, First and Second Faculty of Medicine at Charles University, Prague, Czech Republic
7. University of Pennsylvania Health System, Penn Presbyterian Medical Center, Philadelphia, Pennsylvania, USA
8. New Hanover Regional Medical Center, Wilmington, North Carolina, USA
9. Department of Surgery, Dalhousie University, Halifax, Nova Scotia, Canada
10. Praxis 3+ Chirurgen, Berlin, Germany
11. Department of Digestive Surgery, Robert Debré University Hospital, Reims, France
12. Henares University Hospital, Faculty of Health Sciences, Francisco de Vitoria University, Madrid, Spain
13. Department of Surgery, OLVG Hospital, Amsterdam, the Netherlands