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Vaccines	free resource	MedlinePlus Health Information	https://medlineplus.gov/vaccines.html
	subscription/membership/fee required	Georg Thieme Verlag Stuttgart, New York	https://www.thieme-connect.com/DOI/DOI?10.1016/j.homp.2015.11.001
	free resource	scite Smart Citations	https://scite.ai/reports/27211325