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Levels of evidence
| Levels of evidence | |
|---|---|
| High | Randomized controlled trials in cats |
| Prospective, nonrandomized controlled trials in cats, with adequate sample size and lacking major methodological flaws | |
| Medium | Experimental laboratory trials in cats |
| Retrospective clinical studies with intervention & control groups | |
| Low | Case series in cats without control groups |
| Studies in other species | |
| Expert opinion | |
