1. Department of Surgery; Rijnstate Hospital Arnhem, University Medical Center Groningen, University of Groningen; Groningen the Netherlands
2. Department of Surgery; Isala Clinics Zwolle, University Medical Center Groningen, University of Groningen; Groningen the Netherlands
3. Department of Surgery; Antonius Hospital Sneek, University Medical Center Groningen, University of Groningen; Groningen the Netherlands
4. Division of Vascular Surgery, Department of Surgery; University Medical Center Groningen, University of Groningen; Groningen the Netherlands