- Correspondence to:
Dr L Pereira-da-Silva
Portuguese Paediatric Surveillance Unit, Portuguese Society of Paediatrics, Rua Amílcar Cabral, n° 15, R/C I, 1750-018 Lisbon, Portugal;
- Published in print 1 July 2005.
- Published online 21 June 2005.
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.