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Number of records retrieved by database
| Database | Number of records retrieved |
|---|---|
| Cochrane | 182 |
| EBSCO (All Databases) | 234 |
| Ovid (All Databases) | 984 |
| PubMed | 313 |
| Web of Science (All Databases) | 621 |
| Embase | 783 |
| ProQuest (All Databases) | 320 |
| Australasian Medical Index (via Informit) | 0 |
| Emerald | 72 |
| Grand total | 3509 |
| Total after duplicates removed | 1359 |
