Brazilian Journal of Medical and Biological Research, Vol 37, Iss 9, Pp 1353-1363 (2004) Brazilian Journal of Medical and Biological Research, Volume: 37, Issue: 9, Pages: 1353-1363, Published: SEP 2004 Brazilian Journal of Medical and Biological Research v.37 n.9 2004 Brazilian Journal of Medical and Biological Research Associação Brasileira de Divulgação Científica (ABDC) instacron:ABDC