Name	Info	Provider	Link
	subscription/membership/fee required	Atypon	https://www.ajph.org/doi/10.2105/ajph.80.1.17?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub 0pubmed
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/2293797/
Cited by Patents in	free resource	The Lens - Patent Citations	https://www.lens.org/lens/search/patent/list?q=citation_id:2293797