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    N Engl J Med. 2009 Jul 16;361(3):279-85. Epub 2009 Jun 29.

    Historical perspective--Emergence of influenza A (H1N1) viruses.

    Source

    School of Medicine, University of Pittsburgh, Pittsburgh, PA, USA.

    PMID:
    19564632
    [PubMed - indexed for MEDLINE]
    Free full text

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