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| Author | Checklist for correlates (0–5) | Checklist for risk factors (1–3) | Checklist for causal risk factor (1–7) | Total score (2–15) |
|---|---|---|---|---|
| Gur et al [20] | 4 | 3 | 6 | 13 |
| Sadeghi et al [7] | 4 | 3 | 6 | 13 |
| Taghizadeh et al [18] | 4 | 3 | 6 | 13 |
| Khosravanian et al [17] | 4 | 3 | 6 | 13 |
| Moshtaghion et al [16] | 4 | 3 | 6 | 13 |
| Razi et al [19] | 4 | 3 | 6 | 13 |
