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| subscription/membership/fee required | Ingenta plc | https://www.ingentaconnect.com/openurl?genre=article&issn=&volume=63&issue=2&spage=242&aulast=Gordon | |
| Digestive Diseases | free resource | MedlinePlus Health Information | https://medlineplus.gov/digestivediseases.html |
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| subscription/membership/fee required | Wiley | https://onlinelibrary.wiley.com/doi/10.1097/MPG.0000000000001101 | |
| free resource | scite Smart Citations | https://scite.ai/reports/26720768 | |
| subscription/membership/fee required | Wolters Kluwer | https://doi.org/10.1097/MPG.0000000000001101 |