| Name | Info | Provider | Link |
|---|---|---|---|
| subscription/membership/fee required | Ingenta plc | https://www.ingentaconnect.com/openurl?genre=article&issn=&volume=49&issue=5&spage=448&aulast=Zerem | |
| Endoscopy | free resource | MedlinePlus Health Information | https://medlineplus.gov/endoscopy.html |
| subscription/membership/fee required | Ovid Technologies, Inc. | http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=25647724.ui | |
| subscription/membership/fee required | Wolters Kluwer | https://doi.org/10.1097/MCG.0000000000000296 |