| WHO | World Health Organization |
| PRISMA | Preferred Reporting Items for Systematic Reviews and Meta-Analyses |
| PICO | Population, Intervention, Comparison, Outcome |
| RCT’s | Randomized Controlled Trial |
| RevMan | Review Manager 5.4.1 Software |
| GRADE | Grading of Recommendations Assessment, Development and Evaluation |
| SMD | Standardized Mean Difference |
| CI | Confidence Interval |
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