Multiple System AtrophyCerebellar AtaxiaOlivopontocerebellar AtrophiesShy-Drager SyndromeSupranuclear Palsy, ProgressiveAtrophyAtaxiaalpha-SynucleinSpinocerebellar DegenerationsAutonomic Nervous System DiseasesParkinson DiseasePutamenSynucleinsSpinocerebellar AtaxiasHypotension, OrthostaticGait AtaxiaInclusion BodiesLewy Body DiseaseMidodrineThioninsParkinsonian DisordersFriedreich AtaxiaDiagnostic Techniques, NeurologicalStriatonigral DegenerationCerebellumParkinson Disease, SecondaryPure Autonomic FailureVocal Cord ParalysisLewy BodiesTonic PupilBrainMagnetic Resonance ImagingOligodendrogliaBrain StemExtrapyramidal TractsRecurrent Laryngeal NerveSweat Gland DiseasesAge of OnsetMuscular AtrophyREM Sleep Behavior DisorderCerebellar DiseasesAtaxia TelangiectasiaNeurologic ExaminationNeurodegenerative DiseasesNerve Tissue ProteinsOptic AtrophyNerve DegenerationLevodopaAutonomic Nervous SystemBasal GangliaLaryngoscopyEphedrineElectromyographyAntiparkinson AgentsDihydroxyphenylalanineGenes, RecessiveSeverity of Illness IndexStiff-Person SyndromeMyoclonic Cerebellar DyssynergiaPedigreePonsUrodynamicsReflex, AbnormalPerineumSalicylamidesApraxiasCaudate NucleusMachado-Joseph DiseaseSyndromeNeuronsSubstantia NigraDeath, SuddenUrologic Diseases