Name	Info	Provider	Link
	subscription/membership/fee required	Ingenta plc	https://www.ingentaconnect.com/openurl?genre=article&issn=0163-4356&volume=43&issue=4&spage=555&aulast=Vonk
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=33165217.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/33165217/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/33165217
	subscription/membership/fee required	Wolters Kluwer	https://doi.org/10.1097/FTD.0000000000000829