Name	Info	Provider	Link
	free resource	BioMed Central	https://bmchealthservres.biomedcentral.com/articles/10.1186/s12913-017-2070-1
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/28173796/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/28173796
	free resource	scite Smart Citations	https://scite.ai/reports/28173796
	free resource	Spiral, Imperial College Digital Repository	http://hdl.handle.net/10044/1/44308