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free resource BioMed Central https://hqlo.biomedcentral.com/articles/10.1186/1477-7525-2-33
Managed Care free resource MedlinePlus Health Information https://medlineplus.gov/managedcare.html
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/15248895/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/15248895