| Database searched | Date searched | Number of results |
| CENTRAL (The Cochrane Library) Issue 11 of 12, 2013 (de‐duplicated against 2010 results) |
3/12/13 | 13 |
| MEDLINE (OVID) 2012 to 29/11/13 | 03/12/13 | 34 |
| EMBASE (OVID) 2012 to 27/11/13 | 03/12/13 | 17 |
| LILACS (Bireme) 2012 to May 2014 | 13/5/14 | 5 |
| Total | 69 | |
| After de‐duplication | 59 | |
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