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free resource BioMed Central https://bmcmededuc.biomedcentral.com/articles/10.1186/1472-6920-11-91
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22035246/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/22035246