pharmacoepidemiology, database epidemiology, big data analytics, age related dementias, Vaccines, viral and microbial pathogens, Alzheimer's disease; frontotemporal dementia; primary progressive aphasia; neurodegeneration; biomarkers; neuroimaging; genetics; MRI; PET; amyloid; tau; neuropyschology, early diagnosis and progression of Alzheimer's disease, disease progression models, normal pressure hydrocephalus and neurodegeneration, biostatistics; healthcare services research; Aging and Cognition; Epidemiology of dementia and cognitive impairments; methodology; biostatistics, racial/ethnic disparities