1. Department of Surgery, Amsterdam University Medical Centre, location VU Medical Centre, Amsterdam, The Netherlands
2. Department of Surgery, Hospital Gelderse Vallei, Ede, The Netherlands
3. Department of Surgery, Meander Medical Centre, Amersfoort, The Netherlands
4. Department of Surgery, University Medical Centre Groningen, Groningen, The Netherlands
5. Department of Surgery, Amsterdam University Medical Centre, location Academic Medical Centre, Amsterdam, The Netherlands
6. Department of Surgery, Amphia Hospital, Breda, The Netherlands
7. Department of Surgery, Tergooi Hospital, Hilversum, The Netherlands
8. Department of Surgery, Laurentius Hospital, Roermond, The Netherlands
9. Department of Surgery, Canisius Wilhelmina Hospital, Nijmegen, The Netherlands
10. Department of Surgery, Diakonessenhuis, Utrecht, The Netherlands
11. Department of Surgery, St. Antonius Hospital, Nieuwegein, The Netherlands
12. Department of Surgery, Jeroen Bosch Hospital, Den Bosch, The Netherlands