* There are a lot of examples can be seen as example of articles do meta-analysis, I hope those are helpful :

- First article, can be seen through this link: http://www.journalijar.com/article/15818/maternal-intake-of-folic-acid-supplementation-and-non--syndromic-orofacial-clefts-risk:-systematic-review-and-meta-analysis./

- Second article, can be seen through this link: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5357949/

* In reporting a meta-analysis, the most accepted guideline is: PRISMA