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The quality of randomized controlled studies.
| Study | Year | Randomization | Double-blind | Description of inclusion/exclusion criteria | Scoresa | |
|---|---|---|---|---|---|---|
| 1 | Cowling et al. | 2008 | 2 | 0 | 1 | 3 |
| 2 | Cowling et al. | 2009 | 2 | 0 | 1 | 3 |
| 3 | MacIntyre | 2011 | 2 | 0 | 1 | 3 |
| 4 | Suess et al. | 2012 | 2 | 1 | 1 | 4 |
| 5 | Ailello | 2012 | 2 | 1 | 1 | 4 |
| 6 | Barasheed et al. | 2014 | 2 | 0 | 1 | 3 |
Scoring by Jadad scale.
