DuodenoscopyCrohn DiseaseAlzheimer DiseaseAmyloid beta-PeptidesAmyloid beta-Protein Precursortau ProteinsNeurofibrillary TanglesPlaque, AmyloidBrainApolipoprotein E4DementiaCognition DisordersNeurofibrilsNeuropsychological TestsAmyloid Precursor Protein SecretasesPresenilin-1AmyloidDepressionAtrophySymptom AssessmentDementia, VascularSeverity of Illness IndexPsychiatric Status Rating ScalesMagnetic Resonance ImagingLongitudinal StudiesMild Cognitive ImpairmentApolipoproteins EPeptide FragmentsBehavioral SymptomsQuestionnairesCognitionAge of OnsetPresenilin-2AgingMental Status ScheduleRisk FactorsHippocampusProdromal SymptomsLewy Body DiseaseFollow-Up StudiesTreatment OutcomeNeuronsTime FactorsMice, TransgenicCholinesterase InhibitorsAspartic Acid EndopeptidasesProspective StudiesDisease ProgressionMemory DisordersMemantineCohort StudiesCerebral CortexDisease Models, AnimalPresenilinsPrevalenceAniline CompoundsCase-Control StudiesBrain ChemistryCross-Sectional StudiesQuality of LifeAge FactorsAutopsyNational Institute on Aging (U.S.)Nerve DegenerationDepressive DisorderCerebral Amyloid AngiopathyBiological MarkersAffective SymptomsSubstantia InnominataProtease NexinsParkinson DiseaseNeurodegenerative DiseasesPositron-Emission TomographyCaregiversPsychomotor AgitationAnxietyDown SyndromeGenetic Predisposition to DiseasePhenylcarbamatesIndansTauopathiesRetrospective StudiesStress, PsychologicalAmyloidogenic ProteinsGenotypeAnalysis of VarianceReproducibility of ResultsPredictive Value of TestsThiazolesPsychotic DisordersNerve Tissue ProteinsComorbidity