1. Department of Experimental Clinical Oncology, Aarhus University Hospital, Aarhus N, Denmark;
2. Department of Oncology, Aarhus University Hospital, Aarhus, Denmark;
3. Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark;
4. Department of Neurosurgery, Aarhus University Hospital, Aarhus, Denmark;
5. Danish Center for Particle Therapy, Aarhus, Denmark