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    Perspect Biol Med. 2002 Fall;45(4):499-515.

    Proof of causality: deduction from epidemiological observation.

    Doll R.

    Source

    Clinical Trial Service Unit and Epidemiological Studies Unit, Radcliffe Infirmary, Oxford, United Kingdom.

    PMID:
    12388883
    [PubMed - indexed for MEDLINE]

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