- Correspondence to:
Centre for International Health and Development and Valid International Ltd, Unit 14 Standingford House, 26 Cave Street, Oxford OX4 1BA, UK;
- Accepted September 15, 2006
- First published April 20, 2007.
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.