| 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=21533715.ui | |
| subscription/membership/fee required | Springer | https://link.springer.com/10.1007/s10072-011-0539-y |