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| Study | Reason for exclusion |
|---|---|
| Doudounakis 2000 | 1. The study compared two dose regimens (single dose versus 2 half doses) of the same split virus vaccine. 2. Randomisation and blinding was not stated. |
| Ong 1991 | 1. The study was non‐randomised and non‐blinded. 2. The 2 groups enrolled to this study were not comparable: people with CF versus healthy volunteers. |
CF: cystic fibrosis
