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| Research types | No. | % |
|---|---|---|
| Case series | 57 | 29.2 |
| Randomized clinical trials (RCT) | 51 | 26.2 |
| Case report | 47 | 24.1 |
| Non-RCT | 23 | 11.8 |
| Case control study | 7 | 3.6 |
| One group pretest-posttest design | 7 | 3.6 |
| Cross-over trial | 1 | 0.5 |
| Prospective | 1 | 0.5 |
| Single patient trial ABABA type | 1 | 0.5 |
| Total | 195 | 100.0 |
