| Study | Reason for exclusion |
|---|---|
| Anonymous 1973 | No control group. |
| Breza 1998 | No control group. |
| Diz 1973 | No control group. |
| Grasset 1974 | No control group. |
| Greiner 1970 | No control group. |
| Grévy 1970 | No control group. |
| Guilland‐Vallée 1970 | No control group. |
| Guillemin 1970 | No control group. |
| Huet 1970 | No control group. |
| Lange 1970 | No control group. |
| Lhez 1970 | No control group. |
| Martínez‐Piñeiro '73 | No control group. |
| Robineau 1976 | No control group. |
| Rometti 1970 | No control group. |
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