Age of OnsetHuntington DiseaseTrinucleotide RepeatsAge FactorsRisk FactorsGenotypePedigreeGenetic Predisposition to DiseaseSeverity of Illness IndexPrevalenceSturge-Weber SyndromeRageGene FrequencyComorbiditySex FactorsPolymorphism, Single NucleotideRetrospective StudiesDiagnostic and Statistical Manual of Mental DisordersEssential TremorPsychiatric Status Rating ScalesCohort StudiesTime FactorsCross-Sectional StudiesStatistics as TopicSchizophreniaFollow-Up StudiesProspective StudiesPrognosisBipolar DisorderParkinson DiseaseDisease ProgressionPsychotic DisordersMagnetic Resonance ImagingTreatment OutcomeAnxiety DisordersCognition DisordersMultivariate AnalysisIncidenceBrainFamily HealthLongitudinal StudiesRegression AnalysisMassachusettsAtrophyCase-Control StudiesSex DistributionNeuropsychological TestsMental DisordersLogistic ModelsQuestionnairesPredictive Value of TestsDepressive Disorder, MajorPhenotypeMutationAnticipation, GeneticAllelesRisk AssessmentUnited StatesSpinocerebellar DegenerationsGenetic LinkageDepressive DisorderBiological MarkersNigeriaPenetranceSchizophrenia, CatatonicPrecipitating FactorsDepressionLinear ModelsDiabetes Mellitus, Type 1Socioeconomic FactorsPaternal AgeCerebellar AtaxiaLod ScoreFamilyAlzheimer DiseaseDNA Mutational AnalysisGenetic HeterogeneityPolymorphism, GeneticSchizophrenia, DisorganizedInfant, NewbornQuality of LifeApolipoprotein E4Body Mass IndexGenes, DominantAnxietyProdromal SymptomsSchizophrenia, ChildhoodDNA Repeat ExpansionGenetic Association StudiesCardiovascular DiseasesReproducibility of ResultsNuclear FamilyMenarchePubertyEpilepsyHeterozygoteSensitivity and SpecificityAge DistributionFathersGenetic Testing