Placebo EffectDouble-Blind MethodTreatment OutcomeQuestionnairesCross-Over StudiesRisk FactorsProspective StudiesCross-Sectional StudiesFollow-Up StudiesTime FactorsRandomized Controlled Trials as TopicPilot ProjectsCohort StudiesAnalysis of VarianceUnited StatesLongitudinal StudiesSeverity of Illness IndexSingle-Blind MethodHealth Knowledge, Attitudes, PracticeAge FactorsNeuropsychological TestsAdministration, OralPatient ComplianceClinical Trials as TopicResearch DesignQuality of LifeInterviews as TopicResearch SubjectsPain MeasurementDrug Therapy, CombinationCognitionSex FactorsLogistic ModelsPsychomotor PerformanceMotivationFocus GroupsPsychiatric Status Rating ScalesBody Mass IndexAffectMagnetic Resonance ImagingSmokingDepressionPainReaction TimeIncidenceRisk AssessmentBlood PressureAfrican AmericansReproducibility of ResultsDose-Response Relationship, DrugDrug Administration ScheduleHIV InfectionsExerciseChronic DiseaseLinear ModelsQualitative ResearchPatient SelectionCase-Control StudiesPatient SatisfactionCognition DisordersRegression AnalysisAttitude to HealthAttentionEmotionsBiological MarkersObesityPatient Education as TopicMultivariate AnalysisSelf ReportOdds RatioCardiovascular DiseasesInternetChi-Square DistributionActivities of Daily LivingProgram EvaluationHealth StatusDecision MakingSmoking CessationHealth BehaviorAgingData CollectionDiabetes Mellitus, Type 2Stress, PsychologicalChoice BehaviorDietProportional Hazards ModelsPerceptionMotor ActivityHealth PromotionHypertensionInformed ConsentEuropean Continental Ancestry GroupPsychometricsWalkingLife StylePatient ParticipationAnxietyAlcohol DrinkingFeasibility StudiesPatient Acceptance of Health Care