Aged 1 Aged, 80 and over 1 Alzheimer disease 1 Article 1 Case-Control Studies 1 Cohort Studies 1 Cost of Illness 1 Databases, Factual 1 Dementia 1 Female Health Care Costs 1 Humans 1 Insurance Claim Review 1 Male 1 Parkinson disease 1 Psychotic Disorders 1 Retrospective Studies 1 United States 1 aged 1 case control study 1 cohort analysis 1 comorbidity 1 comparative study 1 complication 1 controlled study 1 cost of illness 1 dementia 1 demography 1 dextromethorphan plus quinidine 1 diffuse Lewy body disease 1