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    CMAJ. 2010 Oct 19;182(15):1638-42. Epub 2010 Jul 19.

    Registration of observational studies: is it time?

    Source

    National Library of Medicine, National Institutes of Health, UnitedStates Department of Health and Human Services, Bethesda, USA. williamsre@mail.nih.gov

    PMID:
    20643833
    [PubMed - indexed for MEDLINE]
    PMCID:
    PMC2952011
    Free PMC Article

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