Name	Info	Provider	Link
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/9259171/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/9259171
	free resource	Wiley	https://onlinelibrary.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=0160-9289&date=1997&volume=20&issue=8&spage=740