| Database | Initial Search | Full Text | Appraisal |
| Google Scholar | 32 | 3 | 0 |
| BNI | 26 | 0 | 0 |
| MEDLINE | 1600 | 1 | 0 |
| CINAHL | 410 | 9 | 1 |
| Cochrane | 38 | 4 | 2 |
| Total | 2106 | 17 | 3 |