Name	Info	Provider	Link
	free resource	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S1751731114003176
Pain	free resource	MedlinePlus Health Information	https://medlineplus.gov/pain.html
	subscription/membership/fee required	Cambridge University Press	https://www.cambridge.org/core/product/identifier/S1751731114003176/type/journal_article