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Criteria for Assessment of Quality of the Included Studies
| Item | Level | Criteria for Inclusion |
|---|---|---|
| Level of studies | High-quality studies | Multivariate analysis performed and had a quality score ≥ 7 |
| Moderate-quality studies | Multivariate analysis performed, but had a quality score < 7 | |
| No multivariate analysis performed and had a quality score≥ 4 | ||
| Low-quality studies | No multivariate analysis performed and had a quality score < 4 |
