1. Department of Otorhinolaryngology–Head and Neck Surgery, Inselspital Bern University Hospital, University of Bern Bern Switzerland
2. Department of Otorhinolaryngology–Head and Neck Surgery, Head and Neck and Sensory Organs Department Sant'Orsola‐Malpighi Hospital, University of Bologna Bologna Italy
3. Department of Radiation Oncology, Inselspital Bern University Hospital, University of Bern Bern Switzerland