This is a systematic review with meta-
-analysis conducted by using literature in
the following databases: Google Scholar;
CINAHL Plus with Full Text, MedicLatina,
Academic Search Complete, MEDLINE with
Full Text, Cochrane Database of Systematic
Reviews, Cochrane Central Register of
Controlled Trials, Nursing & Allied Health
Collection: Comprehensive (via EBSCO),
PubMed and Google scholar. Furthermore,
the analysis of the literature lists of some
review studies allowed us to add two primary
studies. A search was also carried out
in the database of the library ESSV (Escola
Superior de Saúde de Viseu), in which a
study was obtained(1).