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PLoS Clin Trials. 2006 May;1(1):e9.

Factors that can affect the external validity of randomised controlled trials.

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  • 1Stroke Prevention Research Unit, University Department of Clinical Neurology, Radcliffe Infirmary, Oxford, United Kingdom. peter.rothwell@clneuro.ox.ac.uk
PMID:
16871331
[PubMed]
PMCID:
PMC1488890
Free PMC Article
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