1. Departments of Surgery, University Hospital Maastricht, Maastricht, The Netherlands
2. University Hospital Dijkzigt, Rotterdam, The Netherlands
3. Department of Pathology, University Hospital Maastricht, Maastricht, The Netherlands
4. Ikazia Hospital, Rotterdam, The Netherlands
5. St. Joseph Hospital, Eindhoven, The Netherlands
6. Gregorius de Grote Hospital, Brunssum, The Netherlands
7. De Wever Hospital, Heerlen, The Netherlands
8. St. Barbara Hospital, Geleen, The Netherlands
9. Laurentius Hospital, Roermond, The Netherlands
10. Department of Statistics, University of Limburg, Maastricht, The Netherlands