1. Department of Neurology, The David Gheffen School of Medicine at UCLA, Los Angeles, CA 90095, USA
2. Laboratory of Neuroimaging, Department of Neurology, Division of Brain Mapping, The David Gheffen School of Medicine at UCLA, Los Angeles, CA 90095, USA
3. Greater Los Angeles VA Healthcare System, West Los Angeles, CA, 90073, USA
4. Department of Psychiatry, Charles R. Drew University of Medicine and Science, Los Angeles, CA 90043, USA
5. Department of Psychiatry and Biobehavioral Sciences, The David Gheffen School of Medicine at UCLA, Los Angeles, CA 90095, USA