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