METHODS
A systematic review of research literature was
conducted, using a descriptive, exploratory method but
without meta-analysis. A systematic review is a planned
review which answers a specific question and uses explicit
and systematic methods to identify, select and critically
evaluate studies. This method diminishes the bias in the
selection of articles to be reviewed, permitting the
synthesis of studies about relevant problems in a
reproducible and objective manner, by means of the
scientific method(6)