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subscription/membership/fee required Ingenta plc https://www.ingentaconnect.com/openurl?genre=article&issn=1570-159X&volume=17&issue=12&spage=1176&aulast=Li
Pain free resource MedlinePlus Health Information https://medlineplus.gov/pain.html
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/31182003/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/31182003
subscription/membership/fee required Bentham Science Publishers Ltd. http://www.eurekaselect.com/171906/article