Cerebellar AtaxiaMultiple System AtrophyOlivopontocerebellar 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 Diseases