DuodenoscopyCrohn DiseaseParkinson Diseasealpha-SynucleinAntiparkinson AgentsParkinsonian DisordersParkinson Disease, SecondaryLevodopaGlucosylceramidaseSubstantia NigraLewy BodiesDeep Brain StimulationMultiple System AtrophyDopamine1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridineDopaminergic NeuronsOxidopamineSubthalamic NucleusLewy Body DiseaseNeurodegenerative DiseasesMPTP PoisoningGait Disorders, NeurologicSupranuclear Palsy, ProgressivePostural BalanceDance TherapyPutamenEssential TremorUbiquitin-Protein LigasesNeuronsPedunculopontine Tegmental NucleusBrainREM Sleep Behavior DisorderOncogene ProteinsGaucher DiseaseTyrosine 3-MonooxygenasePergolideGaitCarbidopaNerve Degenerationbeta-SynucleinHypokinesiaCorpus StriatumDementiaGlobus PallidusMovement DisordersMesencephalonGenetic Predisposition to DiseaseAge of OnsetMutationManebNeuroprotective AgentsMitochondriaDyskinesias1-Methyl-4-phenylpyridiniumSeverity of Illness IndexOlfaction DisordersNeuropsychological TestsSynucleins