Authors Contributions
All co-authors contributed to the study design and review drafts of the
manuscript. The first author Okafor E.N screened all the article for
inclusion in this review and appraised the study quality. Ugonabu M.C.
and Ufele Silas screened a sample of those at title/abstract and full
text. Okonkwo I.N. scored the quality of the sample of included
articles. Chukwukelu E.E. drafted the manuscript. All authors read and
approved the final version of the manuscript.