| Study | Reason for exclusion |
|---|---|
| Brelje 1966 | Quasi‐random allocation used. |
| Gordon 1974 | Quasi‐random allocation used. |
| Lebherz 1963 | Antibiotic used no longer recommended for use in pregnancy. |
| Walss Rodriguez 1988 | Further information on method of randomisation and allocation to treatment was requested but is not yet available. |
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