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free resource BioMed Central https://bmchealthservres.biomedcentral.com/articles/10.1186/s12913-016-1486-3
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/27412170/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/27412170
free resource scite Smart Citations https://scite.ai/reports/27412170