- Correspondence to Dr Elina Hyppönen, MRC Centre for the Epidemiology of Child Health, UCL Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK;
- Accepted March 28, 2011
- First published April 20, 2011.
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.