- Correspondence to Dr C H Mercer, Research Department of Infection and Population Health, Centre for Sexual Health and HIV Research, University College London, 3rd Floor, Mortimer Market Centre London WC1E 6JB, UK;
- Received March 24, 2016
- Revised June 27, 2016
- Accepted July 17, 2016
- First published August 17, 2016.
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