1. Department of Surgery VieCuri Medical Centre Venlo The Netherlands
2. Department of Surgery Maxima Medical Centre Veldhoven The Netherlands
3. Department of Surgery Maastricht University Medical Centre+ Maastricht The Netherlands
4. Department of Surgery Zuyderland Medical Centre Heerlen The Netherlands
5. Department of Surgery Laurentius Medical Centre Roermond The Netherlands
6. Department of Surgery Catharina Hospital Eindhoven The Netherlands
7. Department of Clinical Epidemiology VieCuri Medical Centre Venlo The Netherlands
8. Department of Epidemiology GROW School for Oncology and Developmental Biology Maastricht University Medical Centre+ Maastricht The Netherlands