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Quality evaluation of included studies by Newcastle-Ottawa Scale.
| References | Selection of subjects/4 | Comparability of groups/2 | Measurement of exposure/3 | Total score of NOS/9 |
|---|---|---|---|---|
| Champoux et al. (10) | 3 | 2 | 2 | 7 |
| Chen et al. (11) | 4 | 1 | 3 | 8 |
| Guo et al. (6) | 3 | 2 | 3 | 8 |
| Kim et al. (7) | 4 | 2 | 3 | 9 |
| Vo et al. (8) | 4 | 1 | 3 | 8 |
| Yang et al. (9) | 3 | 2 | 3 | 8 |
| Wang et al. (5) | 4 | 2 | 3 | 9 |
| Esmaeili-Dooki et al. (13) | 3 | 2 | 3 | 8 |
| Xie et al. (12) | 4 | 2 | 3 | 9 |
| Shen et al. (23) | 4 | 2 | 3 | 9 |
