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| Year published | Author | Newcastle-Ottawa Scale | ||
|---|---|---|---|---|
| Selection | Comparability | Exposure | ||
| 2013 | Gonokova et al. | **** | * | ** |
| 2010 | Amelio et al. | **** | * | ** |
| 2005 | Manganotti et al. | **** | * | ** |
| 2013 | Moon et al. | *** | * | ** |
| 2011 | Sohn et al. | * | − | *** |
