1. Department of Otorhinolaryngology and Head and Neck Surgery Medical University of Vienna Vienna Austria
2. Department of Head and Neck Surgery Shaukat Khanum Memorial Cancer Hospital and Research Centre Lahore Pakistan
3. Institute of Head and Neck Diseases, Evangelical Hospital Vienna Austria
4. Clinical Department of Pathology Medical University of Vienna Vienna Austria
5. Department of Pathology University Health Network, Princess Margaret Cancer Centre Toronto Ontario Canada
6. Department of Otolaryngology Karl Landsteiner University Hospital Krems Austria
7. Department of Radiation Oncology Princess Margaret Cancer Centre, University of Toronto Toronto Ontario Canada
8. Department of Otolaryngology‐Head and Neck Surgery University Health Network, University of Toronto Toronto Ontario Canada