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Gifford RJ, de Oliveira T, Rambaut A, Pybus OG, Dunn D, Vandamme AM, Kellam P, Pillay D; UK Collaborative Group on HIV Drug Resistance.Gifford RJ, et al. Among authors: pybus og.J Virol. 2007 Dec;81(23):13050-6. doi: 10.1128/JVI.00889-07. Epub 2007 Sep 26.J Virol. 2007.PMID: 17898057Free PMC article.