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, Deane KHO, Brady MC, Smith CH, Sackley C, Clarke CE. Speech and language therapy versus placebo or no intervention for speech problems in Parkinson's disease. Cochrane Database of Systematic Reviews 2001, Issue 2. New search for studies and content updated (no change to conclusions) 2012.
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