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Quality assessment according to the NOS of each cohort study
| Study | Selection | Comparability | Outcome | Total score |
|---|---|---|---|---|
| Buchalter, D. B | 3 | 2 | 3 | 8 |
| Cohen, E. M | 4 | 2 | 3 | 9 |
| Dial, B. L | 3 | 2 | 3 | 8 |
| Khatri, K | 3 | 2 | 3 | 8 |
| Koutalos, A. A | 4 | 2 | 3 | 9 |
| Otte, J. E | 3 | 2 | 2 | 7 |
| Patel, N. N | 3 | 2 | 3 | 8 |
| Tahmasebi, M. N | 3 | 2 | 3 | 8 |
| Winkler, C | 3 | 2 | 2 | 7 |
| Xu, X | 3 | 2 | 3 | 8 |
| Yavuz, I. A | 3 | 2 | 3 | 8 |
| Riesgo | 3 | 2 | 3 | 8 |
| Hanada | 3 | 2 | 3 | 8 |
| Matziolis,G | 3 | 2 | 3 | 8 |
