| Study | Reason for exclusion |
|---|---|
| Acheson 1991 | Not an RCT or CCT . |
| Condon 1974 | Not an RCT or CCT. |
| Lemaire 2013 | Not an RCT or CCT. |
| Osuji 2003 | Not an RCTor CCT. |
CCT: controlled clinical trial RCT: randomised controlled trial
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