| Name | Info | Provider | Link |
|---|---|---|---|
| subscription/membership/fee required | Ingenta plc | https://www.ingentaconnect.com/openurl?genre=article&issn=&volume=36&issue=4&spage=W62&aulast=DeFilipp | |
| Fistulas | free resource | MedlinePlus Health Information | https://medlineplus.gov/fistulas.html |
| subscription/membership/fee required | Ovid Technologies, Inc. | http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=32324652.ui | |
| subscription/membership/fee required | Wolters Kluwer | https://doi.org/10.1097/RTI.0000000000000518 |