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Quality of the trials (Jadad scale).
| Trial | Describe | Is adequate | Punctuation | |||
|---|---|---|---|---|---|---|
| Randomized | Double blind | Dropouts exclusions | Randomization | Blinding | ||
| Wong et al. 2004 | 1 | 1 | 1 | 1 | 1 | 5 |
| Jain et al. 2005 | 0 | 0 | 1 | -1 | -1 | -1 |
| Zhang et al. 2007 | 1 | 1 | 1 | 1 | -1 | 3 |
| Wyse et al. 2011 | 1 | 1 | 1 | -1 | -1 | 2 |
| Amr et al. 2013 | 1 | 0 | 0 | 1 | -1 | 1 |
| Gao et al. 2014 | 1 | 1 | 0 | 1 | -1 | 2 |
| Kanno et al. 2020 | 1 | 1 | 1 | 1 | -1 | 3 |
