Name	Info	Provider	Link
Full text from	free resource	HAL archives ouvertes	https://hal.archives-ouvertes.fr/hal-00829458
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=9381053.ui
	subscription/membership/fee required	Silverchair Information Systems	https://academic.oup.com/sleep/article-lookup/doi/10.1093/sleep/20.5.323