- Correspondence to Dr Stefania Vergnano, Division of Child Health, St George's, University of London, Cranmer Terrace, London SW17 0RE, UK;
- Accepted April 26, 2010
- First published September 27, 2010.
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.