O4‐12‐05: EVALUATION OF TAU DEPOSITION IN AMYLOID‐POSITIVE MCI OR MILD AD DEMENTIA SUBJECTS FROM THE ELENBECESTAT MISSION AD PROGRAM USING [18 F]PI‐2620 PET. (1st July 2019) - Stephens, Andrew Wills; Bullich, Santiago; Mueller, Andre; Berndt, Mathias; de Santi, Susan; Scott, David; Adamczuk, Kate; Suhy, Joyce; Kaplow, June; Krause, Stephen; Chang, Julia; Albala, Bruce; et al.