Name	Info	Provider	Link
	subscription/membership/fee required	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S0264-410X(07)00270-8
Smallpox	free resource	MedlinePlus Health Information	https://medlineplus.gov/smallpox.html
	subscription/membership/fee required	ClinicalKey	https://www.clinicalkey.com/content/playBy/pii?v=S0264-410X(07)00270-8