Name	Info	Provider	Link
	free resource	BioMed Central	https://bmcpublichealth.biomedcentral.com/articles/10.1186/s12889-019-6680-x
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/31029118/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/31029118
	free resource	Spiral, Imperial College Digital Repository	http://hdl.handle.net/10044/1/69644