| Study | Reason for exclusion |
|---|---|
| Bard 1973 | Study of umbilical artery catheters. |
| Bhatt 1970 | Published in Abstract form only. The second author was contacted and could offer no further data, except that the study involved infants with arterial, rather than venous, catheters. |
| Cowett 1977 | Study of umbilical artery catheters. |
| Seliem 2010 | Wrong intervention (not systemic antibiotics) |
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