1. Amsterdam UMC Vrije Universiteit Amsterdam, Otolaryngology/Head and Neck Surgery, Cancer Center Amsterdam Amsterdam The Netherlands
2. Amsterdam UMC Vrije Universiteit Amsterdam, Pathology, Cancer Center Amsterdam Amsterdam The Netherlands
3. Department of Otorhinolaryngology/Head and Neck Surgery, Erasmus Medical Center Erasmus MC Cancer Institute Rotterdam The Netherlands
4. Department of Maxillofacial Surgery/Oral Pathology Academic Medical Centre for Dentistry Amsterdam The Netherlands
5. Department of Pathology, Erasmus Medical Center Erasmus MC Cancer Institute Rotterdam The Netherlands