Name	Info	Provider	Link
	free resource	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S0022-3166(22)09277-X
Phenylketonuria	free resource	MedlinePlus Health Information	https://medlineplus.gov/phenylketonuria.html
Cited by Patents in	free resource	The Lens - Patent Citations	https://www.lens.org/lens/search/patent/list?q=citation_id:17513426
	subscription/membership/fee required	Silverchair Information Systems	https://academic.oup.com/jn/article-lookup/doi/10.1093/jn/137.6.1564S