1. Department of Otorhinolaryngology and Head and Neck SurgeryUniversity Medical Center GroningenUniversity of GroningenGroningenthe Netherlands
2. University Center for Geriatric MedicineUniversity Medical Center GroningenUniversity of GroningenGroningenthe Netherlands
3. Department of Head and Neck Oncology and SurgeryNetherlands Cancer Institute/Antoni van LeeuwenhoekAmsterdamthe Netherlands
4. Department of ResearchNetherlands Comprehensive Cancer OrganisationUtrechtthe Netherlands
5. Department of EpidemiologyUniversity Medical Center GroningenUniversity of GroningenGroningenthe Netherlands