Name	Info	Provider	Link
	free resource	HighWire	https://bjgp.org/lookup/pmidlookup?view=long&pmid=22152851
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22152851/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/22152851