1 Department of Otorhinolaryngology, Maxillofacial, and Thyroid Surgery, Fondazione IRCCS National Cancer Institute of Milan, University of Milan, Milan, Italy.
2 Department of Otorhinolaryngology - Head and Neck Surgery, University of Genoa, Genoa, Italy.
3 Department of Otorhinolaryngology - Head and Neck Surgery, University Hospital Leuven, Leuven, Belgium.
4 Section Head and Neck Oncology, Department of Oncology, KU Leuven, Leuven, Belgium.