Researcher in the:

- Department of Research, Cancer Registry of Norway.

- Institute of Population-Based Cancer Research, Oslo, Norway.

- Department of Community Medicine, Faculty of Health Sciences, University of Tromsø, The Arctic University of Norway, Tromsø, Norway.

- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden.

- Genetic Epidemiology Group, Folkhälsan Research Center, Helsinki, Finland