作者单位:Univ Calif Los Angeles, Dept Neurol, Behav Neurol Program, Los Angeles, CA 90024 USA[1]VA Greater Los Angeles Healthcare Syst, Brain Behav & Aging Res Ctr, Los Angeles, CA USA[2]Univ Southern Calif, Mark & Mary Stevens Inst Neuroimaging & Informat, Imaging Genet Ctr, Marina[3]