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N Engl J Med. 2009 Jul 16;361(3):279-85. doi: 10.1056/NEJMra0904322. Epub 2009 Jun 29.

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

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

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PMID:
19564632
DOI:
10.1056/NEJMra0904322
[Indexed for MEDLINE]
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