| Name | Info | Provider | Link |
|---|---|---|---|
| Pain | free resource | MedlinePlus Health Information | https://medlineplus.gov/pain.html |
| subscription/membership/fee required | Ovid Technologies, Inc. | http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=12940326.ui | |
| subscription/membership/fee required | Southern Medical Association | http://dx.doi.org/10.1097/01.SMJ.0000078686.34109.11 |