1. Department of Internal Medicine, Section of Gerontology and Geriatrics Leiden University Medical Center Leiden The Netherlands
2. Department of Head and Neck Surgery and Oncology Netherlands Cancer Institute Amsterdam The Netherlands
3. Department of Otorhinolaryngology and Head and Neck Surgery Radboud University Medical Center Nijmegen The Netherlands
4. Department of Head and Neck Surgery and Oncology Leiden University Medical Center Leiden The Netherlands
5. Department of Medical Oncology Leiden University Medical Center Leiden The Netherlands
6. Institute for Evidence‐based Medicine in Old Age (IEMO) Leiden The Netherlands