Name	Info	Provider	Link
	subscription/membership/fee required	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S0090-4295(09)03120-3
	subscription/membership/fee required	ClinicalKey	https://www.clinicalkey.com/content/playBy?issn=&vol=76&issue=2&pgfirst=283