1. Department of Pathology; University Medical Center Utrecht; Utrecht The Netherlands
2. Department of Pathology; Erasmus University Medical Center Rotterdam; Rotterdam The Netherlands
3. Department of Head and Neck Surgical Oncology; University Medical Center Utrecht; Utrecht The Netherlands
4. Department of Otorhinolaryngology - Head and Neck Surgery, Erasmus Medical Center; University Medical Center Rotterdam; Rotterdam The Netherlands
5. Department of Otorhinolaryngology - Head and Neck Surgery, Erasmus Medical Center Cancer Institute; University Medical Center Rotterdam; Rotterdam The Netherlands