- Dr I N Silva, Department of Paediatrics, Faculty of Medicine, Federal University of Minas Gerais, Avenue Alfredo Balena 190, 30130–100 Belo Horizonte, MG, Brazil.
- Accepted June 5, 1997
- First published September 1, 1997.
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.