DuodenoscopyCrohn DiseaseParkinson DiseaseAlzheimer DiseaseAmyloid beta-Peptidesalpha-SynucleinBrainAntiparkinson Agentstau ProteinsAmyloid beta-Protein PrecursorParkinsonian DisordersNeurofibrillary TanglesPlaque, AmyloidDementiaLewy BodiesParkinson Disease, SecondaryLevodopaLewy Body DiseaseGlucosylceramidaseCognition DisordersNeuropsychological TestsAmyloidApolipoprotein E4Substantia NigraNeurodegenerative DiseasesNeuronsNeurofibrilsDeep Brain StimulationPresenilin-1Amyloid Precursor Protein SecretasesMultiple System AtrophyAge of OnsetNerve DegenerationDopamineAtrophy1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridineMild Cognitive ImpairmentDisease Models, AnimalDopaminergic NeuronsOxidopamineDementia, VascularSupranuclear Palsy, ProgressiveGenetic Predisposition to DiseaseSubthalamic NucleusMagnetic Resonance ImagingMental Status SchedulePeptide FragmentsMutationCognitionMPTP PoisoningApolipoproteins EGait Disorders, NeurologicCase-Control StudiesMice, TransgenicPostural BalancePutamenPositron-Emission TomographySeverity of Illness IndexHippocampusAgingDisease ProgressionTime FactorsPresenilin-2Cerebral CortexAutopsyDance TherapyNerve Tissue ProteinsHypokinesiaEssential TremorUbiquitin-Protein LigasesNeuroprotective AgentsGenotypeLongitudinal StudiesMemory DisordersThiazolesBenzothiazolesCohort StudiesRisk FactorsBiological MarkersGenetic TestingAspartic Acid EndopeptidasesPedunculopontine Tegmental NucleusREM Sleep Behavior DisorderOncogene ProteinsGaitPostmortem ChangesGaucher DiseaseMitochondriaTyrosine 3-MonooxygenaseCholinesterase InhibitorsCarbidopaPergolideAge FactorsMemantinePresenilinsModels, BiologicalAniline CompoundsAnalysis of VarianceOxidative StressPolymorphism, Single Nucleotide