Name	Info	Provider	Link
	subscription/membership/fee required	Ingenta plc	https://www.ingentaconnect.com/openurl?genre=article&issn=1935-5068&volume=81&issue=3&spage=147&aulast=de Marco Salvadori
Phenylketonuria	free resource	MedlinePlus Health Information	https://medlineplus.gov/phenylketonuria.html