Name	Info	Provider	Link
	subscription/membership/fee required	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S1413-3555(18)30073-X
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/31130170/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/31130170
	subscription/membership/fee required	ClinicalKey	https://www.clinicalkey.com/content/playBy/pii?v=S1413-3555(18)30073-X