enquête (4) recherche (4) rayonnement (4) oncologie (4) gestion (4) cancer (4) Diagnosis (4) Surgery (4) Treatment (4) Cancer (4) Care (4) Agreement (4) Methods (4) Swiss (4) Surgery (4) Surgeons (4) Standardization (4) Research (4) Radiation (4) Oncology (4) Oncologists (4) Neck (4) Materials (4) Management (4) Teaching hospitals (4) Head (4) Diagnosis (4) Cancer--Research (4) Cancer (4) Biochemical markers (4)