- Correspondence to Professor David Lewis, Centre for HIV and STIs, Room F30, National Institute for Communicable Diseases (NHLS), Private Bag X4, Sandringham 2131, South Africa;
- Received October 27, 2013
- Accepted October 28, 2013
- First published November 15, 2013.
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.