Name	Info	Provider	Link
	subscription/membership/fee required	Atypon	https://www.pnas.org/doi/10.1073/pnas.1424804112?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/26080409/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/26080409
Full text from University of California eScholarship	free resource	eScholarship, California Digital Library, University of California	https://escholarship.org/uc/item/1hn8k2ff
	free resource	scite Smart Citations	https://scite.ai/reports/26080409