| Database | Date searched | Number of results |
| CENTRAL Issue 8 of 12, 2014 (The Cochrane Library) (searched 2010 to 2014) |
10 September 2014 | 47 |
| MEDLINE and MEDLINE in Process (OVID) August 2010 to 9 September 2014 | 10 September 2014 | 147 |
| EMBASE (OVID) August 2010 to 9 September 2014 | 10 September 2014 | 429 |
| CINAHL (EBSCO) August 2010 to September 2014 | 16 September 2014 | 40 |
| Web of Science (SCI & CPCI‐S) 2010 to September 2014 | 16 September 2014 | 263 |
| Total | 926 | |
| After de‐duplication | 717 | |
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