| Study | Reason for exclusion |
|---|---|
| Cornelissen 1992 | Non‐RCT. |
| Grey 2008 | Non‐RCT. |
| Mosler 2003 | Non‐RCT. |
| Nicolaidou 2006 | Non‐RCT, non‐CF control group. |
| Wilson 2001 | Uncontrolled study, non‐RCT. |
CF: cystic fibrosis RCT: randomised controlled trial
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