| Study | Reason for exclusion |
|---|---|
| Desmonts 1984 | Not randomised. |
| Douche 1996 | Not randomised. |
| Excler 1985 | Not randomised. |
| Foulon 1999 | Not randomised. |
| Knerer 1995 | Not randomised. |
| Kraubig 1966 | Not randomised. |
| Lambotte 1976 | Not randomised. |
| Roux 1976 | Not randomised. |
| Thoumsin 1992 | Not randomised. |
| Wallon 1997 | Not randomised. |
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