1. Department of Oncology, Aarhus University Hospital, Aarhus, Denmark
2. Danish Center for Particle Therapy, Aarhus University Hospital, Aarhus, Denmark
3. Department of Oncology, Rigshospitalet, Copenhagen, Denmark
4. Department of Oncology, Herlev Hospital, Copenhagen, Denmark
5. Department of Oncology, Zealand University Hospital, Naestved, Denmark
6. Department of Oncology, Odense University Hospital, Odense, Denmark
7. Department of Oncology, Aalborg University Hospital, Aalborg, Denmark
8. Department of Otorhinolaryngology, Head and Neck Surgery, Aarhus University Hospital, Aarhus, Denmark