1. Oslo Centre for Biostatistics and Epidemiology Oslo University Hospital Oslo Norway
2. Oslo Centre for Biostatistics and Epidemiology, Department of Biostatistics Institute of Basic Medical Sciences, University of Oslo Oslo Norway
3. Department of Health Management and Health Economics, Institute of Health and Society University of Oslo Oslo Norway
4. Cancer Registry of Norway Oslo Norway
5. Department of Community Medicine and Global Health, Institute of Health and Society University of Oslo Oslo Norway