1. Inselspital Head and Neck Anticancer Center Bern University Hospital Bern Switzerland
2. Department of ENT, Head and Neck Surgery, Inselspital Bern University Hospital, University of Bern Bern Switzerland
3. Department of Radiation Oncology, Inselspital Bern University Hospital Bern Switzerland
4. Clinical Trials Unit University of Bern Bern Switzerland
5. Department of Otolaryngology, Head & Neck Surgery University Hospital Zurich, University of Zurich Zurich Switzerland