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Association between pre-diagnostic circulating vitamin D concentration and risk of colorectal cancer in European populations:a nested case-control study

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General Info
Geography 
Denmark (DNK)
France (FRA)
Germany (DEU)
Greece (GRC)
Italy (ITA)
Norway (NOR)
Spain (ESP)
Sweden (SWE)
Time period covered 
01/1992 - 12/2003