1. Cancer Registry of Norway Oslo Norway
2. Department of Mathematics University of Oslo Oslo Norway
3. Oslo Centre for Biostatistics & Epidemiology Oslo University Hospital Oslo Norway
4. Institute for Cancer Research Oslo University Hospital Oslo Norway
5. Institute of Clinical Medicine University of Oslo Oslo Norway
6. Institute of Basic Medical Sciences University of Oslo Oslo Norway
7. Department of Preventive Medicine University of Southern California, Keck School of Medicine Los Angeles California USA
8. Department of Life Sciences and Health Oslo Metropolitan University Oslo Norway