Association of plasma beta-amyloid level and cognitive reserve with subsequent cognitive decline.
Yaffe K, Weston A, Graff-Radford NR, Satterfield S, Simonsick EM, Younkin SG, Younkin LH, Kuller L, Ayonayon HN, Ding J, et al. JAMA. 2011 Jan 19; 305(3):261-6.