Clinical and Biomedical Research, Vol 33, Iss 3/4 (2013) Clinical & Biomedical Research; Vol. 33 No. 3/4 (2013): Revista HCPA Clinical and Biomedical Research; v. 33 n. 3/4 (2013): Revista HCPA Clinical and Biomedical Research Universidade Federal do Rio Grande do Sul (UFRGS) instacron:UFRGS Clinical & Biomedical Research; v. 33, n. 3/4 (2013) Clinical and Biomedical Research; v. 33, n. 3/4 (2013) Repositório Institucional da UFRGS