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McKeown E, Doerner R, Nelson S, Low N, Robinson A, Anderson J, Elford J.McKeown E, et al.Sex Transm Infect. 2012 Dec;88(8):595-600. doi: 10.1136/sextrans-2011-050436. Epub 2012 Jun 20.Sex Transm Infect. 2012.PMID: 22717471
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