| Name | Info | Provider | Link |
|---|---|---|---|
| subscription/membership/fee required | Elsevier Science | https://linkinghub.elsevier.com/retrieve/pii/S0028-3770(08)00418-9 | |
| Pain | free resource | MedlinePlus Health Information | https://medlineplus.gov/pain.html |
| subscription/membership/fee required | Masson (France) | http://www.em-consulte.com/retrieve/pii/S0028-3770(08)00418-9 |