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Flow-chart of the study. Seventy participants (including 36 SCA3/MJD patients and 34 normal controls) volunteered and were screened for inclusion and exclusion criteria. Five SCA3/MJD patients had to be excluded because they were younger than 18 years old. Three normal controls had to be excluded because they had neurological or psychiatric deficits. Sixty-two participants (including 31 SCA3/MJD patients and 31 normal controls) were enrolled in the study.
