Clinical & Biomedical Research; Vol. 41 No. 2 (2021) Clinical and Biomedical Research; v. 41 n. 2 (2021) Repositório Institucional da UFRGS Universidade Federal do Rio Grande do Sul (UFRGS) instacron:UFRGS Clinical and Biomedical Research Clinical and Biomedical Research, Vol 41, Iss 2 (2021)