1 Leonard Davis School of Gerontology, University of Southern California, Los Angeles, CA 90089, USA.
2 Department of Neurology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033 USA.
3 Alzheimer's Disease Research Center, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA.
4 Corwin D. Denney Research Center, Department of Biomedical Engineering, Viterbi School of Engineering, University of Southern California, Los Angeles, CA 90089, USA.