Name	Info	Provider	Link
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=18186522.ui
	free resource	Wiley	https://onlinelibrary.wiley.com/doi/10.1002/ajh.21065
Full text from	free resource	CORE	https://core.ac.uk/reader/53979822?utm_source=linkout
Full text from	free resource	Institutional Repository of University of Modena and Reggio Emilia (IRIS UNIMORE)	https://iris.unimore.it/retrieve/handle/11380/612901/110472/Amulticenterretrospective.pdf