| Database | Years searched | Date of search | Results (before de‐duplication) | Results (after de‐duplication) |
| Airways Register | June 2012 to June 2013 | 19 June 2013 | 11 | 3 |
| CENTRAL (Issue 5, 2013) | June 2012 to June 2013 | 19 June 2013 | 9 | 3 |
| MEDLINE (Ovid) | June 2012 to June 2013 | 19 June 2013 | 30 | 12 |
| EMBASE (Ovid) | June 2012 to June 2013 | 19 June 2013 | 166 | 104 |
| PsycINFO (Ovid) | June 2012 to June 2013 | 19 June 2013 | 10 | 9 |
| CINAHL (EBSCO) | June 2012 to June 2013 | 19 June 2013 | 32 | 28 |
| CAB Abstracts | June 2012 to July 2013 | 29 July 2013 | 4 | 4 |
| Global Health Library | 2000 to present | 19 June 2013 | 231 | 45 |
| Compendex/Inspec/Referex | January 2012 to July 2013 | 29 July 2013 | 44 | 41 |
| IEEEXplore | January 2012 to July 2013 | 29 July 2013 | 18 | 18 |
| ACM Digital Library | January 2012 to July 2013 | 29 July 2013 | 9 | 4 |
| CiteSeerx | January 2012 to July 2013 | 29 July 2013 | 1 | 1 |
| ERIC | January 2012 to July 2013 | 19 June 2013 | 0 | 0 |
| Total | 565 | 272 (260 after de‐duplication of combined EndNote library) |
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