Synthesis
We reported the number of eligible studies according to design, sample size, methodological quality / risk of bias, and proportions and measures of association for primary outcomes for each practice. We did not report results for secondary outcomes considering the large number of retained studies and the fact that results on secondary outcomes led to the same conclusions. Similarly, we did not conduct meta-analysis or assess the credibility of evidence because identified studies on the same practice were either all case series (no measures of association) or evaluated different outcomes.