Name	Info	Provider	Link
	subscription/membership/fee required	Ingenta plc	https://www.ingentaconnect.com/openurl?genre=article&issn=&volume=25&issue=7&spage=488&aulast=Pappalardo
	subscription/membership/fee required	Wolters Kluwer	https://doi.org/10.2459/JCM.0000000000001627