The meta-analysis and Meta regressions were conducted using STATA 14 software. 
STATA 14 software
The databases used were PubMed, Google Scholar, and HINARI literature. 
Google Scholar
The databases used were PubMed, Google Scholar, and HINARI literature. 
PubMed
The databases used were PubMed, Google Scholar, and HINARI literature. 
HINARI literature
We used the Joanna Briggs Institute (JBI) Meta-Analysis of Statistics Assessment and Review Instrument for critical appraisal of studies. 
Joanna Briggs Institute (JBI)