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Estcourt C, Sutcliffe L, Cassell J, Mercer CH, Copas A, James L, Low N, Horner P, Clarke M, Symonds M, Roberts T, Tsourapas A, Johnson AM.Estcourt C, et al. Among authors: mercer ch.Sex Transm Infect. 2012 Feb;88(1):21-6. doi: 10.1136/sti.2010.047258. Epub 2011 Jul 27.Sex Transm Infect. 2012.PMID: 21795290Clinical Trial.