Name	Info	Provider	Link
Allergy	free resource	MedlinePlus Health Information	https://medlineplus.gov/allergy.html
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=33476397.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/33476397/
Full Text at the institutional repository	free resource	Andalusian Health Repository	http://hdl.handle.net/10668/17006
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/33476397
	subscription/membership/fee required	Wiley	https://doi.org/10.1111/all.14745
	free resource	scite Smart Citations	https://scite.ai/reports/33476397