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 TelangiectasiaNerve Tissue ProteinsNeurologic ExaminationNeurodegenerative DiseasesOptic AtrophyNerve DegenerationLevodopaAutonomic Nervous SystemLaryngoscopyBasal GangliaElectromyographyEphedrineAntiparkinson AgentsDihydroxyphenylalanineGenes, RecessiveStiff-Person SyndromeMyoclonic Cerebellar DyssynergiaPedigreePonsReflex, AbnormalPerineumUrodynamicsApraxiasSeverity of Illness IndexSalicylamidesNeuronsCaudate NucleusMachado-Joseph DiseasePurkinje CellsSubstantia NigraDeath, Sudden