1. Department of Surgery, Northwest Clinics, Alkmaar, the Netherlands
2. Department of Surgery, Amsterdam University Medical Center, Amsterdam, the Netherlands
3. Department of Dermatology, Zaans Medisch Centrum, Zaandam, the Netherlands
4. Department of Surgery, Red Cross Hospital, Beverwijk, the Netherlands
5. Department of Vascular Surgery, Maasstad Hospital, Rotterdam, the Netherlands
6. Department of Vascular Surgery, OLVG, Amsterdam, the Netherlands
7. Department of Surgery, Maastricht Universitair Medisch Centrum+, Maastricht, the Netherlands