Brazilian Journal of Medical and Biological Research, Vol 36, Iss 1, Pp 39-44 (2003) Brazilian Journal of Medical and Biological Research, Volume: 36, Issue: 1, Pages: 39-44, Published: JAN 2003 Brazilian Journal of Medical and Biological Research v.36 n.1 2003 Brazilian Journal of Medical and Biological Research Associação Brasileira de Divulgação Científica (ABDC) instacron:ABDC