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 Medical Oncology; Leiden University Medical Center; Leiden The Netherlands
4. Department of Medical Oncology; Antoni van Leeuwenhoek Hospital/Netherlands Cancer Institute; Amsterdam The Netherlands
5. Department of Head and Neck Surgical Oncology; University Medical Center Utrecht; Utrecht The Netherlands
6. University of Groningen, Department of Medical Oncology, University Medical Center Groningen; Groningen The Netherlands
7. Department of Otolaryngology-Head and Neck Surgery; VU University Medical Center; Amsterdam The Netherlands
8. Department of Medical Oncology; Erasmus Medical Center Cancer Institute, Erasmus University Medical Center Rotterdam; The Netherlands
9. Department of Medical Oncology; Maastricht University Medical Center; Maastricht The Netherlands
10. Department of Head and Neck Oncology and Surgery; Antoni van Leeuwenhoek Hospital/Netherlands Cancer Institute; Amsterdam The Netherlands
11. Department of Pathology; University Medical Center Utrecht; Utrecht The Netherlands
12. University of Groningen, Department of Oral and Maxillofacial Surgery, University Medical Center Groningen; Groningen The Netherlands
13. Department of Medical Oncology; VU University Medical Center; Amsterdam The Netherlands
14. Department of Otorhinolaryngology/Head and Neck Surgery; Erasmus University Medical Center; Rotterdam The Netherlands
15. Department of Pathology; Radboud University Medical Center; Nijmegen The Netherlands
16. Radboud Institute for Health Sciences, Biostatistics, Radboud University Medical Center; Nijmegen The Netherlands
17. Department of Pathology; Leiden University Medical Center; Leiden The Netherlands