1. Division of Otorhinolaryngology, Head and Neck Surgery, Cantonal Hospital Olten, Switzerland
2. Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital, Basel, Switzerland
3. Department of Otorhinolaryngology, Head and Neck Surgery, University of Cologne, Germany / Centre for Molecular Medicine Cologne (CMMC), Cologne, Germany / Department of Otorhinolaryngology, Head and Neck Surgery, Grosshadern Medical Centre, Ludwig-Maximi
4. Department of Otorhinolaryngology, Head and Neck Surgery, Grosshadern Medical Centre, Ludwig-Maximilians-University of Munich, Germany / Department of General, Visceral and Cancer Surgery, University of Cologne, Germany
5. Department of Otorhinolaryngology, Head and Neck Surgery, University Medical Centre Göttingen, Georg August University, Göttingen, Germany
6. University Hospital Basel, Department of Internal Medicine, Medical Oncology, Basel, Switzerland / Cancer Immunology, Department of Biomedicine, University of Basel, Switzerland