Association between an Alzheimer's Disease-Related Index and APOE ε4 Gene Dose. oleh Frank Schraml, Kewei Chen, Napatkamon Ayutyanont, Roontiva Auttawut, Jessica B S Langbaum, Wendy Lee, Xiaofen Liu, Dan Bandy, Stephanie Q Reeder, Gene E Alexander, Richard J Caselli, Adam S Fleisher, Eric M Reiman, Alzheimer’s Disease Neuroimaging Initiative