Level of Evidence
| Level | Description |
|---|---|
| 1 | High-quality prospective randomized clinical trial |
| 2 | Prospective comparative study |
| 3 | Retrospective case control study |
| 4 | Case Series |
| 5 | Expert Opinion |
Webpage Last Modified:
1 March, 2010
| Level | Description |
|---|---|
| 1 | High-quality prospective randomized clinical trial |
| 2 | Prospective comparative study |
| 3 | Retrospective case control study |
| 4 | Case Series |
| 5 | Expert Opinion |
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