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| Level of evidence | Frequency (%) | |
|---|---|---|
| I | Randomized control trial, systematic review, meta-analysis | 0 (0.0) |
| II | Tow gorups nonrandomized studies | 7 (77.8) |
| III | One group nonrandomized studies | 1 (11.1) |
| IV | Single-subject design, surveys | 1 (11.1) |
| V | Case reports, narrative literature reviews, qualitative research | 0 (0.0) |
| Total | 9 (100.0) | |
