spinocerebellar ataxia treatmenthereditary spinocerebellar ataxiaspinocerebellar ataxia friedreichspinocerebellar ataxia diagnosisspinocerebellar ataxia prognosisspinocerebellar ataxia type 4ataxia typesspinocerebellar ataxia cureinfantile onset spinocerebellar ataxiasca spinocerebellar ataxiaspinocerebellar diseasespinocellular ataxia