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| Database | Dates | Result |
|---|---|---|
| CINAHL Plus (EBSCO Publishing) [1981–] | 01/01/1990 to 09/01/2015 | 512 |
| Embase (Ovid) [1974–] | 01/01/1990 to 09/01/2015 | 275 |
| Medline (PubMed) [1948–] | 01/01/1990 to 09/01/2015 | 63 |
| PsycINFO (EBSCO Publishing) [1800–] | 01/01/1990 to 09/01/2015 | 57 |
| SSCI (Web of Science) [1956–] | 01/01/1990 to 09/01/2015 | 806 |
