1. Department of Neurology and Neurological Sciences, Stanford University School of Medicine, Stanford, CA 94305, USA.
2. Division of Immunology and Rheumatology, Department of Medicine, Stanford University School of Medicine, Stanford, CA 94305, USA.
3. Geriatric Research, Education and Clinical Center, Veterans Affairs Palo Alto Health Care System, Palo Alto, CA 94304, USA.
4. Department of Molecular and Cellular Biology and Genome Center, Metabolomics Group, University of California, Davis, Davis, CA 95616, USA.
5. Department of Clinical Neuroscience, Karolinska Institute, 171 76 Stockholm, Sweden.
6. F.M. Kirby Neurobiology Center, Harvard Medical School, Boston, MA 02115, USA.
7. Diabetes and Obesity Research Center, Sanford-Burnham Medical Research Institute, Orlando, FL 32827, USA.