Table 2. Quality assessment of included studies based on Newcastle-Ottawa Scale.
Author | Selection | Comparability | Exposure |
Polidori | 3 | 2 | 3 |
Carantoni | 4 | 2 | 3 |
Cervellati | 3 | 0 | 3 |
Cascalheira | 3 | 2 | 3 |
Can | 4 | 1 | 3 |
Kim | 3 | 2 | 3 |
Cankurtaran | 3 | 2 | 2 |
Iuliano | 4 | 2 | 3 |
Zafrilla | 3 | 2 | 2 |
Foy | 4 | 2 | 3 |
Maesaka | 3 | 2 | 3 |