Goodall et al. BMC Public Health 2012, 12:747 http://www.biomedcentral.com/1471-2458/12/747 Abbreviations MSM: Men who have sex with men; STI: Sexually transmitted infections; UAI: Unprotected anal intercourse; UAI partners: Partners with whom men have had unprotected anal intercourse. Competing interests The authors declare they have no competing interests. Authors’ contributions DC and PF initiated the project. LG collected patient data. All authors contributed to the preparation of the manuscript. Acknowledgements The authors would like to thank Rob Elton for his contribution in the statistical analysis of our data. Author details 1Chalmers Centre, 2A Chalmers Street, Edinburgh EH3 9ES, UK. 2School of Health and Life Sciences, Glasgow Caledonian University, Glasgow G4 0BA, UK. Received: 9 May 2012 Accepted: 30 August 2012 Published: 6 September 2012 References 1. 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