1. Department of ResearchCancer Registry of NorwayOslo Norway
2. Oslo and Akershus University College of Applied SciencesOslo Norway
3. Cancer Registry of NorwayOslo Norway
4. Institute of Basic Medical SciencesUniversity of OsloOslo Norway
5. Department of Preventive MedicineUniversity of Southern CaliforniaLos Angeles California
6. The Norwegian University of Science and TechnologyTrondhjem Norway
7. Department of RegistrationCancer Registry of NorwayOslo Norway