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Quality scores of studies using Newcastle-Ottawa Scale (maximum score of 9)
| Study | Selection | Comparability | Outcome | Overall quality |
|---|---|---|---|---|
| Rao GA | 4 | 2 | 3 | 9 |
| Wang KL | 4 | 2 | 2 | 8 |
| Pasternak B | 4 | 2 | 3 | 9 |
| Huang CC | 4 | 2 | 2 | 8 |
| Bhaskaran K | 4 | 2 | 3 | 9 |
| Azoulay L | 4 | 2 | 3 | 9 |
| Hallas J | 4 | 2 | 3 | 9 |
| Chang CH | 4 | 2 | 3 | 9 |
