- Correspondence to Cristina Helena Rama, Hospital Maternidade Leonor Mendes de Barros, Av Celso Garcia, 2477, 03015-000 Belenzinho São Paulo-SP, Brazil;
- Accepted July 6, 2009
- First published August 19, 2009.
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.