| Name | Info | Provider | Link |
|---|---|---|---|
| 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=22913307.ui | |
| subscription/membership/fee required | Silverchair Information Systems | https://meridian.allenpress.com/joi/article-lookup/doi/10.1563/AAID-JOI-D-12-00083 |