Name Info Provider Link
Pain free resource MedlinePlus Health Information https://medlineplus.gov/pain.html
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/30617851/
subscription/membership/fee required Springer https://dx.doi.org/10.1007/s13365-018-0703-8
free resource Europe PubMed Central https://europepmc.org/abstract/MED/30617851