1. NORDCAN (2008) Cancer incidence, mortality, and prevalence in the Nordic Countries. Version 3.2 Association of Nordic Cancer Registries. Danish Cancer Society; 2008. http://www-dep.iarc.fr/nordcan.htm . Accessed 8 June 2008
2. The Danish Cancer Registry (2008) The National Board of Health
3. Wulf HC (2000) Sunlight exposure and skin cancer (editorial) (Danish). Ugeskr Laeger 162:3303
4. Lindqvist C (1979) Risk factors in lip cancer: a questionnaire survey. Am J Epidemiol 109:521–530
5. International Agency for Research on Cancer (1992) Solar and ultraviolet radiation. IARC monograph on the evaluation of carcinogenic risk of chemicals to humans, vol 55. IARC Press, Lyon