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Risk of bias in studies.
| First Author | Domains | Results | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1-Selection | 2-Comparability | 3-Outcome | Total | |||||||
| a | b | c | d | a | a.1 | a | b | c | Max 9 | |
| Alqahtani 2019 [50] | 0 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 7 |
| Alqahtani 2019 [51] | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 6 |
| Javed 2016 [52] | 0 | 0 | 0 | 1 | 1 | 0 | 1 | 1 | 1 | 5 |
| Al Deeb 2020 [53] | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 6 |
| Fernandes-Costa 2019 [54] | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 6 |
| Machtei 2020 [55] | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 6 |
| C.M de Waal 2015 [56] | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 6 |
