1. Veterans Administration Greater Los Angeles Healthcare System, Los Angeles (Holiday, Khattab, Chavez, Melrose, Mendez); Department of Neurology, University of California, Los Angeles (UCLA) (Holiday, Sheppard, Khattab, Chavez, Mendez); Department of Psychiatry and Biobehavioral Sciences, David Geffen School of Medicine at UCLA (Melrose, Mendez).