Name	Info	Provider	Link
	free resource	HighWire	https://jech.bmj.com/lookup/pmidlookup?view=long&pmid=9764278
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/9764278/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/9764278