Cost of IllnessHealth Care CostsCosts and Cost AnalysisDrug CostsCost ControlDirect Service CostsCost-Benefit AnalysisCost SharingCritical IllnessCost AllocationSeverity of Illness IndexUnited StatesMental DisordersModels, EconomicIllness BehaviorEmployer Health CostsHospitalizationQuality-Adjusted Life YearsChronic DiseaseRetrospective StudiesQuestionnairesInfluenza, HumanInfant, NewbornTime FactorsFeverProspective StudiesHealth ResourcesRespiratory Tract InfectionsLength of StayFoodborne DiseasesSick RoleTreatment OutcomeRisk FactorsMentally Ill Persons