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Contributors All authors have contributed significantly towards data collection or analysis and interpretation All authors have contributed significantly towards drafting the work and approval of the final version and agree to be accountable for all aspects of the work. The authors wish to express their deep appreciation of the late Professor Martin Fisher who assisted in drafting and critical revision of this project.
Competing interests LM has received sponsorship from Gilead and Janssen to attend conferences and courses. DR has received sponsorship from Gilead and Janssen to attend conferences, and from Viiv for lecturing. DA has received sponsorship from MSD to attend a conference.
Provenance and peer review Not commissioned; internally peer reviewed.
Data sharing statement The data analysed in this study was presented at the 11th International Congress on Drug Therapy in HIV Infection, Glasgow 2012 and the British Association of Sexual Health and HIV (BASHH) spring conference, Bristol 2013. The abstract presented in Glasgow can be found at http://www.jiasociety.org/index.php/jias/article/view/18165.