[2443] Brown, P. J., Devanand D. P., Liu X., Caccappolo E., & Alzheimer's Disease Neuroimaging Initiative(A. D. N. I.) (2011).  Functional Impairment in Elderly Patients With Mild Cognitive Impairment and Mild Alzheimer Disease. Arch Gen Psychiatry. 68(6), 617 - 626.