Brazilian Journal of Medical and Biological Research v.45 n.1 2012 Brazilian Journal of Medical and Biological Research Associação Brasileira de Divulgação Científica (ABDC) instacron:ABDC Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP Brazilian Journal of Medical and Biological Research, Volume: 45, Issue: 1, Pages: 38-42, Published: JAN 2012 Brazilian Journal of Medical and Biological Research, Vol 45, Iss 1, Pp 38-42 (2012)