Review Manager 5.4.1 was used for statistical analysis.



Review Manager 5.4.1
The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines were followed for the study, and electronic databases like PubMed Central, Cochrane database and Embase were searched. 
PubMed Central
The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines were followed for the study, and electronic databases like PubMed Central, Cochrane database and Embase were searched. 
Cochrane database
The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines were followed for the study, and electronic databases like PubMed Central, Cochrane database and Embase were searched. 
Embase