Brazilian Journal of Medical and Biological Research v.35 n.8 2002 Brazilian Journal of Medical and Biological Research Associação Brasileira de Divulgação Científica (ABDC) instacron:ABDC Brazilian Journal of Medical and Biological Research, Vol 35, Iss 8, Pp 895-903 (2002) Brazilian Journal of Medical and Biological Research, Volume: 35, Issue: 8, Pages: 895-903, Published: AUG 2002