| Study | Reason for exclusion |
|---|---|
| Fukase 1994 | Non‐randomised study (retrospective case review) |
| Fukase 2004 | Non‐randomised study (retrospective case review) |
| Kim 2000 | Non‐randomised study (retrospective case review) |
| Misumi 1991 | Retrospective review of cases |
| Mizumoto 1992 | Retrospective review of cases |
| Nishida 1993 | Non‐randomised study (retrospective case review) |
| Tada 1998 | Non‐randomised study (retrospective case review), reported in Tada 2000 |
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