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Quality assessment of included studies.
| Author | Year | Selection | Comparability | Exposure | Total score |
|---|---|---|---|---|---|
| Cinek | 2018 | 4 | 1 | 2 | 7 |
| Higuchi | 2018 | 3 | 1 | 2 | 6 |
| Huang | 2018 | 4 | 1 | 2 | 7 |
| Leiva-Gea | 2018 | 4 | 2 | 2 | 8 |
| Salamon | 2018 | 3 | 1 | 2 | 6 |
| de Groot | 2017 | 3 | 1 | 2 | 6 |
| Pellegrini | 2017 | 4 | 2 | 2 | 8 |
| Stewart | 2017 | 3 | 1 | 2 | 6 |
| Qi | 2016 | 4 | 2 | 2 | 8 |
| Mejia-Leon | 2014 | 3 | 2 | 2 | 7 |
