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Disposition of records
| Total records retained | 155 | |
| Duplicate authors found | −51 | |
| Excluded | −50 | (not USA, op ed, textbook, study abroad) |
| Disqualified | −36 | (not a study, not undergrad) |
| Total Assessed | 18 | |
| Literature reviews | −5 | Retained for reference and cross-check |
| Intervention | 5 | |
| Evaluation | 8 |
