Name	Info	Provider	Link
	subscription/membership/fee required	Ingenta plc	https://www.ingentaconnect.com/openurl?genre=article&issn=1570-159X&volume=17&issue=12&spage=1176&aulast=Li
Pain	free resource	MedlinePlus Health Information	https://medlineplus.gov/pain.html
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/31182003/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/31182003
	subscription/membership/fee required	Bentham Science Publishers Ltd.	http://www.eurekaselect.com/171906/article