1. From the Departments of Radiation Oncology, Medical Oncology, and Head and Neck Surgery, University Hospital Zürich, Zürich; University Hospital Berne; SIAK Coordinating Center, Berne; University Hospital Geneva, Geneva; University Hospital Lausanne, Lausanne; Ospedale San Giovanni, Bellinzona; Kantonsspital St Gallen, St Gallen; Kantonsspital Basel, Basel; Kantonsspital Winterthur, Winterthur; Kantonsspital Luzern, Luzern; Hôpital Cantonal de Sion; Kantonsspital Aarau, Aarau; Stadtspital Triemli,...