1. Department of Registration, Cancer Registry of Norway, Institute of Population-Based Cancer Research, Oslo, Norway;
2. Department of Research and Innovation, Møre and Romsdal Hospital Trust, Ålesund, Norway;
3. Department of Oncology, Oslo University Hospital, Oslo, Norway;
4. Faculty of Medicine, University of Oslo, Oslo, Norway;
5. Department of Medical Physics, Oslo University Hospital, Oslo, Norway;
6. The Norwegian Radiation Protection Authority, Østerås, Norway