- Correspondence to:
Dr T Hesketh
Centre for International Child Health, Institute of Child Health, University College London, 30 Guilford St, London WC1 N1EH, UK;
- First published August 21, 2006.
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.