1. Department of Oncology, Akershus University Hospital, Lørenskog, Norway;
2. Department of Physics, University of Oslo, Oslo, Norway;
3. Department of Radiology and Nuclear Medicine, Oslo University Hospital, Oslo, Norway;
4. Department of Oncology, Oslo University Hospital, Oslo, Norway;
5. Department of Pathology, Oslo University Hospital, Oslo, Norway;
6. Department of Tumor Biology, Institute for Cancer Research, Oslo University Hospital, Oslo, Norway;
7. Faculty of Medicine, University of Oslo, Oslo, Norway;
8. Department of Gastroenterological Surgery, Oslo University Hospital, Oslo, Norway;
9. Department of Physics, Norwegian University of Science and Technology, Trondheim, Norway