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free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24556779/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/24556779
free resource scite Smart Citations https://scite.ai/reports/24556779
free resource Wolters Kluwer https://journals.lww.com/24556779.pmid