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Caffeine free resource MedlinePlus Health Information https://medlineplus.gov/caffeine.html
subscription/membership/fee required Ovid Technologies, Inc. http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=32999056.ui
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/32999056/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/32999056
free resource Dryad Digital Repository https://datadryad.org/discover?query=10.1212/WNL.0000000000010863