Speech and language therapy versus placebo or no intervention for speech problems in Parkinson's disease

An intervention review to compare the efficacy of speech and language therapy versus placebo or no intervention for speech and voice problems in patients with Parkinson's disease.
Herd CP, Tomlinson CL et al. Speech and language therapy versus placebo or no intervention for speech problems in Parkinson's disease. Cochrane Database of Systematic Reviews 2012, Issue 8.

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