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| Grade | Scale |
| 0 | No visible lesions |
| 1 | Redness and hyperemia in the mucosa |
| 2 | One or two erosions or hemorrhaging lesions |
| 3 | 3-10 erosions or hemorrhaging lesions |
| 4 | > 10 erosions or hemorrhaging lesions or an ulcer |
Note: Erosions are defined as flat, white-based mucosal breaks of any size; Ulcers are defined as mucosal breaks of at least 3 mm or more.
