1. Department of Head and Neck Oncology and SurgeryThe Netherlands Cancer Institute Amsterdam The Netherlands
2. Department of Oral and Maxillofacial SurgeryAcademic Medical Center Amsterdam The Netherlands
3. Department of Radiation OncologyThe Netherlands Cancer Institute Amsterdam The Netherlands
4. Bristol Biomedical Research Centre, National Institute of Health (NIHR)University of Bristol Bristol UK
5. Centre for Trials Research, College of Biomedical and Life SciencesCardiff University Cardiff UK
6. Infections and Cancer EpidemiologyGerman Cancer Research Center (DKFZ) Heidelberg Germany
7. Bristol Dental SchoolFaculty of Health Sciences, University of Bristol Bristol UK