1. Genetic Epidemiology Group, Folkhälsan Research Center, Helsinki, Finland
2. Faculty of Medicine, University of Helsinki, Helsinki, Finland
3. Department of Social Services and Health Car, Åbo Akademi University, Jakobstad, Finland
4. Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
5. Department of Research, Cancer Registry of Norway, Institute of Population Based Cancer Research Oslo, Tromsø, Norway
6. Department of Community Medicine, Faculty of Health Sciences, University of Tromsø, The Arctic University of Norway, Tromsø, Norway