Name	Info	Provider	Link
	free resource	Ediciones Doyma, S.L.	http://www.elsevier.es/en/linksolver/ft/pii/S0213-9111(11)00267-6
	free resource	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S0213-9111(11)00267-6
Stress	free resource	MedlinePlus Health Information	https://medlineplus.gov/stress.html