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The NOS of each included study.
| Article | Selection | Comparability | Outcome | Total |
|---|---|---|---|---|
| Reichmuth 2005 | ∗∗∗∗ | ∗ | ∗∗ | 7 |
| Bakker 2015 | ∗∗∗∗ | ∗∗ | ∗∗ | 7 |
| Nagayoshi 2016 | ∗∗∗∗ | ∗ | ∗∗∗ | 8 |
| Botros 2009 | ∗∗∗∗ | ∗∗ | ∗∗ | 8 |
| Appleton 2015 | ∗∗∗∗ | ∗∗ | ∗∗ | 8 |
| Kendzerska 2014 | ∗∗∗∗ | ∗∗ | ∗∗∗ | 9 |
| Marshall 2009 | ∗∗∗∗ | ∗∗ | ∗∗∗ | 9 |
