- Dr F M Cowan, Centre for Sexual Health and HIV Research, Royal Free and University College Medical School, University College London, Mortimer Market Centre, off Capper Street, London WC1E 6AU, UK;
- Accepted July 3, 2008
- First published August 6, 2008.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.