| Study | Reason for exclusion |
|---|---|
| Atsukawa 2013 | Not a randomised trial. |
| Benetti 2008 | Not a randomised trial. |
| Bitetto 2010 | Not a randomised trial. |
| Fernández Fernández 2016 | Not a randomised trial. |
| Floreani 2007 | Not a randomised trial. |
| Kitson 2016 | Not a randomised trial. |
| Kondo 2013 | Not a randomised trial. |
| Ladero 2013 | Not a randomised trial. |
| Long 1978 | Not a randomised trial. |
| Malham 2012 | Not a randomised trial. |
| Papapostoli 2016 | Not a randomised trial. |
| Rode 2010 | Not a randomised trial. |
| Stokes 2016 | Not a randomised trial. |
| Terrier 2015 | Not a randomised trial. |
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