Department of Medicine, University of California, San Diego, La Jolla, CA, United States of America.|Departments of Radiology and Neurosciences, UCSD, San Diego, CA, United States of America.|Department of Medicine, University of California, San Diego, La Jolla, CA, United States of America.|Computational Neurobiology Lab, Salk Institute for Biological Studies, La Jolla, San Diego, CA, United States of America.|Computational Neurobiology Lab, Salk Institute for Biological Studies, La Jolla, San Diego, CA, United States of America.|Dept. of Neurology, Massachusetts General Hospital and Harvard University, Boston, MA, United States of America.|Departments of Radiology and Neurosciences, UCSD, San Diego, CA, United States of America.|Department of Medicine, University of California, San Diego, La Jolla, CA, United States of America.