1. Department of Otorhinolaryngology and Head and Neck Surgery, GROW School for Oncology and Developmental Biology Maastricht University Medical Center Maastricht the Netherlands
2. Department of Otorhinolaryngology and Head and Neck Surgery Zuyderland Medical Center Heerlen the Netherlands
3. Department of Radiation Oncology (MAASTRO), GROW School for Oncology and Developmental Biology Maastricht University Maastricht the Netherlands
4. Department of Pathology, GROW School for Oncology and Developmental Biology Maastricht University Medical Center Maastricht the Netherlands