1 Department of Psychiatry and Behavioral Sciences, University of California, San Francisco, California; Center for Imaging of Neurodegenerative Diseases, Veterans Administration Medical Center, San Francisco, California. Electronic address: scott.mackin@ucsf.edu.
2 Department of Psychiatry and Behavioral Sciences, University of California, San Francisco, California; Clinical Memory Research Unit, Faculty of Medicine, Lund University, Lund, Sweden.