| Database | Results | After deduplication | Custom 4 field |
| MEDLINE and MEDLINE In‐Process | 100 | 90 | MEDLINE 17/07/2014 |
| EMBASE | 225 | 170 | EMBASE 17/07/2014 |
| CINAHL | 34 | 12 | CINAHL 17/07/2014 |
| CENTRAL | 7 | 3 | CENTRAL 17/07/2014 |
| The International Clinical Trials Registry Platform (ICTRP) | 5 | 5 | ICTRP 17/07/2014 |
| ClinicalTrials.gov | 7 | 7 | CLINICALTRIALS.GOV 17/07/2014 |
| Total | 378 | 287 |
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