Name	Info	Provider	Link
	subscription/membership/fee required	Springer	http://link.springer.com/article/10.1023/b:ajcp.0000004755.51641.d3
	subscription/membership/fee required	Wiley	https://onlinelibrary.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=0091-0562&date=2003&volume=32&issue=3-4&spage=371