| Name | Info | Provider | Link |
|---|---|---|---|
| Gastrointestinal Bleeding | free resource | MedlinePlus Health Information | https://medlineplus.gov/gastrointestinalbleeding.html |
| subscription/membership/fee required | Wiley | https://onlinelibrary.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=0007-1323&date=1988&volume=75&issue=3&spage=256 | |
| subscription/membership/fee required | Silverchair Information Systems | https://academic.oup.com/bjs/article-lookup/doi/10.1002/bjs.1800750323 |