1. Department of Sport Sciences; Linnaeus University; Kalmar Sweden
2. Department of Public Health Sciences; Karolinska Institutet; Stockholm Sweden
3. Swedish Radiation Safety Authority; Stockholm Sweden
4. Section of General Practice; Department of Public Health; University of Copenhagen; Copenhagen Denmark
5. Department of Clinical Sciences in Lund; University of Lund; Lund Sweden
6. Department of Medicine; Unit of Dermatology and Venereology; Karolinska University Hospital and Karolinska Institutet; Stockholm Sweden
7. Center for Epidemiology and Community Medicine; Stockholm County Council; Stockholm Sweden