Name	Info	Provider	Link
	subscription/membership/fee required	Ingenta plc	https://www.ingentaconnect.com/openurl?genre=article&issn=0025-7974&volume=96&issue=43&spage=e8427&aulast=Fan
Pain	free resource	MedlinePlus Health Information	https://medlineplus.gov/pain.html
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=29069043.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/29069043/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/29069043
	free resource	scite Smart Citations	https://scite.ai/reports/29069043
	free resource	Wolters Kluwer	https://doi.org/10.1097/MD.0000000000008427