Name	Info	Provider	Link
	subscription/membership/fee required	Ediciones Doyma, S.L.	http://linkinghub.elsevier.com/retrieve/pii/S1575-0922(11)00111-2
	subscription/membership/fee required	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S1575-0922(11)00111-2
Clinical Trials	free resource	MedlinePlus Health Information	https://medlineplus.gov/clinicaltrials.html