The early diversification of influenza A/H1N1pdm. (Nelson M, Spiro D, Wentworth D, Beck E, Fan J, Ghedin E, Halpin R, Bera J, Hine E, Proudfoot K, Stockwell T, Lin X, Griesemer S, Kumar S, Bose M, Viboud C, Holmes E, Henrickson K) PLoS Curr 2009 Nov 03;1:RRN1126 PMID: 20029664 PMCID: PMC2773564 12/24/2009