IM Spence-Lewis MD,
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4759858/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4759858/
https://link.springer.com/article/10.1186/s12889-016-2838-y
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4759858/
http://bmcpublichealth.biomedcentral.com/articles/10.1186/s12889-016-2838-y