Clinical & Biomedical Research; Vol. 37 No. 2 (2017) Clinical and Biomedical Research; v. 37 n. 2 (2017) Repositório Institucional da UFRGS Universidade Federal do Rio Grande do Sul (UFRGS) instacron:UFRGS Clinical and Biomedical Research Clinical and Biomedical Research, Vol 37, Iss 2 (2017)