Brazilian Journal of Medical and Biological Research, Vol 34, Iss 10, Pp 1237-1245 (2001) Brazilian Journal of Medical and Biological Research, Volume: 34, Issue: 10, Pages: 1237-1245, Published: OCT 2001 Brazilian Journal of Medical and Biological Research v.34 n.10 2001 Brazilian Journal of Medical and Biological Research Associação Brasileira de Divulgação Científica (ABDC) instacron:ABDC Scopus-Elsevier