| Name | Info | Provider | Link |
|---|---|---|---|
| subscription/membership/fee required | Elsevier Science | https://linkinghub.elsevier.com/retrieve/pii/S0165-5876(20)30469-9 | |
| Fistulas | free resource | MedlinePlus Health Information | https://medlineplus.gov/fistulas.html |
| subscription/membership/fee required | ClinicalKey | https://www.clinicalkey.com/content/playBy/pii?v=S0165-5876(20)30469-9 |