1. Department of Medical Oncology; Radboud University Medical Center; Nijmegen The Netherlands
2. The Institute of Cancer Research and The Royal Marsden NHS Foundation Trust; London United Kingdom
3. Department of Head and Neck Surgical Oncology; University Medical Center Utrecht; Utrecht The Netherlands
4. Department of Otolaryngology/Head; Neck Surgery VU University Medical Center; Amsterdam The Netherlands
5. Department of Otorhinolaryngology/Head and Neck surgery Erasmus MC Cancer Institute; Erasmus University Medical Center; Rotterdam The Netherlands
6. Department of Head and Neck Oncology and Surgery; Antoni van Leeuwenhoek/Netherlands Cancer Institute; Amsterdam The Netherlands
7. Department of Otorhinolaryngology and Head and Neck surgery; Leiden University Medical Center; Leiden The Netherlands
8. Department of Oral and Maxillofacial Surgery; University of Groningen, University Medical Center Groningen; Groningen The Netherlands
9. Department of Medical Oncology; Maastricht University Medical Center; Maastricht The Netherlands
10. Department of Pathology; University Medical Center Utrecht; Utrecht The Netherlands
11. Department of Pathology; VU University Medical Center; Amsterdam The Netherlands
12. Department of Pathology; Antoni van Leeuwenhoek/Netherlands Cancer Institute; Amsterdam The Netherlands
13. Department of Medical Oncology; University of Groningen, University Medical Center Groningen; Groningen The Netherlands
14. Department for Health evidence; Radboud University Medical Center; Nijmegen The Netherlands
15. Department of Pathology; Radboud University Medical Center; Nijmegen The Netherlands