1. Department of Otolaryngology – Head and Neck Surgery Amsterdam UMC, Vrije Universiteit Amsterdam Amsterdam The Netherlands
2. Department of Head and Neck Surgical Oncology University Medical Center Utrecht Cancer Center Utrecht The Netherlands
3. Department of Otolaryngology – Head and Neck Surgery Leiden University Medical Center Leiden The Netherlands
4. Department of Pathology Amsterdam UMC, Vrije Universiteit Amsterdam Amsterdam The Netherlands
5. Department of Otolaryngology Dijklander Hospital Hoorn The Netherlands