Table 2.
Methodologic quality of the included studies (Newcastle–Ottawa Scale)
| Study | Selection | Comparability | Exposure |
|---|---|---|---|
| Dullerud | ☆☆☆☆ | ☆☆ | ☆☆☆ |
| Knackstedt | ☆☆☆ | ☆ | ☆☆☆ |
| Krakenes | ☆☆☆☆ | ☆☆ | ☆☆ |
| Myran | ☆☆☆☆ | ☆☆ | ☆☆ |
| Vetti | ☆☆☆☆ | ☆☆ | ☆☆☆ |
| Wilmink | ☆☆☆ | ☆☆ | ☆☆ |
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