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subscription/membership/fee required Elsevier Science https://linkinghub.elsevier.com/retrieve/pii/S0109-5641(09)00213-9
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/19592083/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/19592083
subscription/membership/fee required ClinicalKey https://www.clinicalkey.com/content/playBy/pii?v=S0109-5641(09)00213-9