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Exclusion Criteria and Number of Excluded Articles According to the Reason for their Exclusion
| Exclusion Criteria | Nr of Excluded Articles |
|---|---|
| Subject not relevant to orthodontics | 74 |
| Subject not relevant to orthodontics - Cleft lip and palate | 6 |
| Letter to the editor | 1 |
| Book Reviews | 1 |
| Protocol for a Cochrane review | 1 |
| Report of cases & Systematic review | 1 |
| Short survey | 1 |
| Comments on other articles | 11 |
| Original studies | 19 |
| Narrative reviews | 14 |
| Systematic reviews | 41 |
| Sum | 170 |
