| Study | Reason for exclusion |
|---|---|
| APTED 1957 | Not randomized |
| Balasegaram 2006 | Retrospective analysis |
| Burri 1995 | Not a comparative study |
| Butler 1957 | Not a comparative study |
| Ceccaldi 1953 | Not a comparative study |
| Chappuis 2005 | Not a prospective trial |
| Eozenou 1989 | Not a comparative study |
| Janssens 1977 | Not randomized |
| Khonde 1997 | Not a comparative study |
| Moens 1984 | Not a comparative study |
| Mpia 2002 | Not a comparative study |
| Ogada 1973 | Retrospective analysis |
| Pepin 1985 | Retrospective analysis |
| Pepin 1989 | Not a comparative study |
| Schmid 2005 | Not a comparative study |
| Van Nieuwenhove 1985 | Not a comparative study |
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