| Name | Info | Provider | Link |
|---|---|---|---|
| Chronic Pain | free resource | MedlinePlus Health Information | https://medlineplus.gov/chronicpain.html |
| free resource | PubMed Central | https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/32975541/ | |
| free resource | Europe PubMed Central | https://europepmc.org/abstract/MED/32975541 | |
| subscription/membership/fee required | Quintessence Publishing Company | https://doi.org/10.11607/ofph.2582 |