1. Laboratory of Radiation Physics, Odense University Hospital, Odense, Denmark;
2. Institute of Clinical Research, University of Southern Denmark, Odense, Denmark;
3. Danish Centre for Particle Therapy, Aarhus University Hospital, Aarhus, Denmark;
4. Institute of Medical Physics, School of Physics, The University of Sydney, Sydney, Australia;
5. Department of Oncology, Rigshospitalet, Copenhagen, Denmark;
6. Department of Oncology, Copenhagen University Hospital Herlev, Copenhagen, Denmark;
7. Department of Oncology, Odense University Hospital, Odense, Denmark;
8. Department of Oncology, Aarhus University Hospital, Aarhus, Denmark;
9. The Norwegian Radium Hospital, Oslo University Hospital, Oslo, Norway;
10. Department of Oncology, Aalborg University Hospital, Aalborg, Denmark;
11. Department of Experimental Clinical Oncology, Aarhus University Hospital, Aarhus, Denmark