Repositório Institucional da UFRGS Universidade Federal do Rio Grande do Sul (UFRGS) instacron:UFRGS Clinical and Biomedical Research, Vol 31, Iss 1 (2011) Clinical & Biomedical Research; v. 31, n. 1 (2011): Revista HCPA Clinical and Biomedical Research; v. 31, n. 1 (2011): Revista HCPA Clinical & Biomedical Research; Vol. 31 No. 1 (2011): Revista HCPA Clinical and Biomedical Research; v. 31 n. 1 (2011): Revista HCPA Clinical and Biomedical Research