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Quality assessment of studies using the Newcastle–Ottawa scale.
| Study | Selection | Comparability | Outcome | Total Quality Score |
|---|---|---|---|---|
| Gasper 2021 [36] | **** | *** | 7 | |
| Shraim 2019 [37] | **** | ** | *** | 9 |
| Lee 2016 [30] | **** | ** | *** | 9 |
| Shraim 2015 [15] | **** | ** | *** | 9 |
| Gross 2009 [38] | **** | * | *** | 8 |
| Webster 2007 [17] | **** | ** | *** | 9 |
Number of stars = score (* = 1, ** = 2, *** = 3, **** = 4).
