1. Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark;
2. Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway;
3. Cancer Registry of Norway, Oslo, Norway;
4. Public Health Sciences Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA;
5. Department of Medicine Solna, Division of Clinical Epidemiology, Karolinska Institutet, Stockholm, Sweden;
6. Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden;
7. Department of Medical Sciences, Unit of Hematology, Uppsala University, Uppsala, Sweden;
8. Division of Cancer Epidemiology and Biostatistics, National Cancer Institute, National Institutes of Health, Rockville, MD, USA