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Spinocerebellar Ataxias (SCAs) are a group of autosomal dominantly inherited neurodegenerative diseases, involving the cerebellum and the brainstem. Genetic testing is the most important method of diagnosis. Nowadays, nearly 40 types of SCAs have been identified by genetic analysis. Peripheral nerve impairment is common in SCAs: electrophysiological examination of SCA1, SCA2 and SCA3 usually shows...