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subscription/membership/fee required Elsevier Science https://linkinghub.elsevier.com/retrieve/pii/S1544-3191(15)30635-X
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21382806/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/21382806
subscription/membership/fee required ClinicalKey https://www.clinicalkey.com/content/playBy/pii?v=S1544-3191(15)30635-X