FatigueMuscle FatigueFatigue Syndrome, ChronicMental FatigueQuestionnairesTreatment OutcomeTime FactorsRisk FactorsCross-Sectional StudiesDepressionQuality of LifePrevalenceSeverity of Illness IndexUnited StatesAttitude to HealthProspective StudiesReproducibility of ResultsGreat BritainFollow-Up StudiesSex FactorsHealth Knowledge, Attitudes, PracticeEmotionsInterviews as TopicHealth StatusDecision MakingActivities of Daily LivingSocioeconomic FactorsAge FactorsAnalysis of VarianceChronic DiseaseRisk AssessmentCohort StudiesPatient Acceptance of Health CareAnxietyStress, PsychologicalFocus GroupsInterpersonal RelationsSocial SupportRetrospective StudiesQualitative ResearchMagnetic Resonance ImagingNeoplasmsAlgorithmsEnglandHealth SurveysPainAdaptation, PsychologicalPsychiatric Status Rating ScalesAgingRural PopulationPrejudiceSensitivity and SpecificityPublic OpinionExerciseSocial PerceptionNetherlandsHealth Services for the AgedCultureAffectLongitudinal StudiesAustraliaRegression AnalysisChoice BehaviorChinaGuiltModels, TheoreticalHealth Services AccessibilityFrail ElderlySymptom AssessmentResidence CharacteristicsBrainGeriatric AssessmentMoralsAccidental FallsGames, ExperimentalJudgmentPredictive Value of TestsLonelinessData CollectionPsychometricsMotivationEmpathyDepressive DisorderLogistic ModelsAttitude of Health PersonnelCognitionInfant, NewbornSocial BehaviorHIV InfectionsIncidenceLinear ModelsPhysician-Patient RelationsAge DistributionPerceptionHealth BehaviorReaction TimeInternetModels, PsychologicalNeuropsychological TestsWorld Health