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Grades of recommendation (given to various treatment options based on the level of evidence supporting that treatment)
| Grade A | Treatment options are supported by strong evidence (consistent with level I or II studies) |
| Grade B | Treatment options are supported by fair evidence (consistent with level III or IV studies) |
| Grade C | Treatment options are supported by either conflicting or poor quality evidence (level IV studies) |
| Grade D | When insufficient evidence exists to make a recommendation |
