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free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21971894/
free resource Scientific Electronic Library Online https://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-31802011000400002&lng=en&nrm=iso&tlng=en
free resource Europe PubMed Central https://europepmc.org/abstract/MED/21971894