1. Faculty of Public Health and Policy; London School of Hygiene and Tropical Medicine; London UK
2. Department of Medical Epidemiology and Biostatistics; Karolinska Institutet; Stockholm Sweden
3. Department of Community Medicine, Faculty of Health Sciences; University of Tromsø, The Arctic University of Norway; Tromsø Norway
4. Genetic Epidemiology Group, Folkhälsan Research Center, Faculty of Medicine; Helsinki University; Helsinki Finland
5. Department of Research, Cancer Registry of Norway; Institute of Population-Based Cancer Research; Oslo Norway