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Johnson SA, Simms I, Sheringham J, Bickler G, Bennett CM, Hall R, Cassell JA.Johnson SA, et al. Among authors: sheringham j.Sex Transm Infect. 2010 Jun;86(3):217-21. doi: 10.1136/sti.2009.037283. Epub 2010 May 10.Sex Transm Infect. 2010.PMID: 20460264Free article.
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