 6. Has a project partner able to separately consent on hisher own behalf and take part in the study with the intent to do so as long as the participant is enrolled, providing information on the cognitive, functional, and behavioral status of the participant and assisting with observation of adverse events AEs and monitoring of study medication, if needed. Project partners participating in the pivotal AD-4833TOMM40_301 study are encouraged to participate in this extension study in this capacity. 