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 DisorderAtaxia TelangiectasiaCerebellar DiseasesNeurodegenerative DiseasesNerve Tissue ProteinsNeurologic ExaminationOptic AtrophyNerve DegenerationLevodopaAutonomic Nervous SystemLaryngoscopyBasal GangliaEphedrineElectromyographyAntiparkinson AgentsDihydroxyphenylalanineGenes, RecessiveStiff-Person SyndromeMyoclonic Cerebellar DyssynergiaPedigreePonsPerineumReflex, AbnormalUrodynamicsSalicylamidesApraxiasSeverity of Illness IndexCaudate NucleusMachado-Joseph DiseaseNeuronsSubstantia NigraDeath, Sudden