1. Rijnstate, Arnhem, The Netherlands.
2. Alliantie Regionale Topzorg (A.R.T.Z.), Arnhem, The Netherlands.
3. Netherlands Comprehensive Cancer Organisation (IKNL), Utrecht, The Netherlands.
4. Netherlands Cancer Registration, Netherlands Comprehensive Cancer Organisation (IKNL), Utrecht, The Netherlands.
5. Slingeland Hospital, Doetinchem, The Netherlands.
6. Ziekenhuis Gelderse Vallei, Ede, The Netherlands.