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Parkinson's Disease Center and Movement Disorders Clinic, Department of Neurology, Baylor College of Medicine, Houston, Texas, USA Address correspondence and reprint requests to Dr. Joseph Jankovic, Director, Parkinson's Disease Center and Movement Disorders Clinic, Department of Neurology, Baylor College of Medicine, 6550 Fannin St. #1801, Houston, TX 77030, USA; E-mail: [email protected]
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Thomas et al. (2003) studied this question.
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