| Name | Info | Provider | Link |
|---|---|---|---|
| subscription/membership/fee required | Ediciones Doyma, S.L. | http://www.elsevier.es/en/linksolver/ft/ivp/0210-5705/30/375 | |
| subscription/membership/fee required | Elsevier Science | https://linkinghub.elsevier.com/retrieve/pii/13108816 | |
| Colonoscopy | free resource | MedlinePlus Health Information | https://medlineplus.gov/colonoscopy.html |