1. From the Department of Biostatistics (M.C.B., D-E.L., C.C-G., C.S.C.), College of Public Health, University of Iowa, Iowa City, IA; Elucidate Health, LLC (K.A.P.), Brookfield, CT; Department of Neurology (A.S.), Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA; Institute for Neurodegenerative Disorders (K.M.), New Haven, CT.