| Resource | N |
| CENTRAL | 112 |
| MEDLINE | 603 (515 Trials 88 SR) |
| Embase | 283 (158 Trials 125 SR) |
| Epistemonikos | 0 |
| ClincialTrials.gov | 655 |
| ICTRP | 80 |
| Total | 1737 |
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