| Study | Reason for exclusion |
|---|---|
| Barrio 2008 | Not a randomised trial. |
| Fellermann 2002 | Not a randomised trial. |
| Hisamatsu 2000 | Not a randomised trial. |
| JPRN‐UMIN000003785 | Wrong patient population. |
| JPRN‐UMIN000005033 | Wrong intervention. |
| Touchefeu 2007 | Not a randomised trial. |
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