1. Institute of Clinical Research, University of Southern Denmark, Odense, Denmark;
2. Laboratory of Radiation Physics, Odense University Hospital, Odense, Denmark;
3. Department of Medical Physics, Vejle Hospital, Vejle, Denmark;
4. Department of Medical Physics, Aalborg University Hospital, Aalborg, Denmark;
5. Department of Medical Physics, Aarhus University Hospital, Aarhus, Denmark;
6. Institute of Clinical Medicine, Aarhus University, Aarhus, Denmark;
7. Department of Oncology, Aarhus University Hospital, Aarhus, Denmark