- Dr Carla Teixeira Ferreira, Rua Bartolomeu Portela, 50/505, Botafogo CEP: 22.290.190, Rio de Janeiro, Brasil. Fax 55.21.542.5071
- Received 20 March 1997
- Revised 5 February 1998
- Accepted 16 February 1998
- Published online 1 September 1998.
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.