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Lancet. 2004 May 22;363(9422):1728-31.

When are observational studies as credible as randomised trials?

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  • 1Department of Clinical Epidemioloy, Leiden University Medical Centre, Bldg 1 C9-P, 2300 RC Leiden, Netherlands. J.P.Vandenbroucke@lumc.nl
PMID:
15158638
[PubMed - indexed for MEDLINE]
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