- Correspondence to Dr Gwenda Hughes, HIV & STI Department, Centre for Infectious Disease Surveillance and Control, Public Health England Colindale, 61 Colindale Avenue, London NW9 5EQ, UK;
- Received January 21, 2013
- Revised May 29, 2013
- Accepted June 9, 2013
- First published July 12, 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.