1 Leonard Davis School of Gerontology, University of Southern California, Los Angeles, CA, USA.
2 Neuroscience Graduate Program, University of Southern California, Los Angeles, CA, USA.
3 Clayton Foundation Laboratories for Peptide Biology, The Salk Institute for Biological Studies, La Jolla, CA, USA.
4 Mayo Clinic, Department of Neuroscience, Jacksonville, FL, USA.
5 Imaging Genetics Center, Institute for Neuroimaging and Informatics, University of Southern California, Los Angeles, CA, USA.
6 Department of Neurology, University of Southern California, Los Angeles, CA, USA.
7 Human and Evolutionary Biology Section, Department of Biological Sciences, Dornsife College of Letters, Arts and Sciences, University of Southern California, Los Angeles, CA, USA.
8 Rush Alzheimer's Disease Center, Rush University Medical Center, Chicago, IL, USA.
9 Laboratory of Neuro Imaging, USC Stevens Neuroimaging and Informatics Institute, Keck School of Medicine of University of Southern California, Los Angeles, CA, USA.
10 Leonard Davis School of Gerontology, University of Southern California, Los Angeles, CA, USA. [email protected].