A blood-based diagnostic test incorporating plasma Aβ42/40 ratio, ApoE proteotype, and age accurately identifies brain amyloid status: findings from a multi cohort validity analysi... by Tim West, Kristopher M. Kirmess, Matthew R. Meyer, Mary S. Holubasch, Stephanie S. Knapik, Yan Hu, John H. Contois, Erin N. Jackson, Scott E. Harpstrite, Randall J. Bateman, David M. Holtzman, Philip B. Verghese, Ilana Fogelman, Joel B. Braunstein, Kevin E. Yarasheski

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