Name	Info	Provider	Link
	subscription/membership/fee required	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S0883-9441(10)00340-0
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=21273030.ui
	subscription/membership/fee required	W.B. Saunders	http://journals.elsevierhealth.com/retrieve/pii/S0883-9441(10)00340-0
	subscription/membership/fee required	ClinicalKey	https://www.clinicalkey.com/content/playBy/pii?v=S0883-9441(10)00340-0