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Functional outcomes are of particular interest.
They must have been randomised and include a concurrent control group receiving another intervention. Each trial was assessed for internal validity by each of the two reviewers. Meta-analysis was not possible because results were presented in an incompatable form. A Peto odds ratio was calculated where this was appropriate, otherwise a descriptive summary of the results of the individual studies was compiled. They were short term, used single injection sessions with follow-up of between 4 and 26 weeks.