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Lancet. 2004 May 22;363(9422):1724-7.

Those confounded vitamins: what can we learn from the differences between observational versus randomised trial evidence?

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  • 1Department of Social Medicine, University of Bristol, UK. d.a.lawlor@bristol.ac.uk

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PMID:
15158637
[PubMed - indexed for MEDLINE]
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