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This is a reprint of a paper that first appeared in the Sex Transm Infect, 2012, Volume 88, pages 566–7.
Contributors WCW conceptualised this manuscript, undertook the literature review and did the initial draft. MRK provided useful resources and, edited and advised on the subsequent drafts. JDT has revised on the editorial substantially and provided additional data to enrich this paper.
Competing interests None.
Provenance and peer review Commissioned; externally peer reviewed.