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	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/29442293/
	subscription/membership/fee required	Springer	https://dx.doi.org/10.1007/s40259-018-0260-y
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/29442293
	free resource	scite Smart Citations	https://scite.ai/reports/29442293