1. Department of Radiology and Biomedical Imaging, University of California – San Francisco, San Francisco, CA, USA
2. Helen Wills Neuroscience Institute, University of California, Berkeley, CA, USA
3. Department of Neurology, University of California-San Diego, San Diego, CA, USA
4. Department of Neurology, Mayo Clinic, Rochester MN, USA
5. Avid Radiopharmaceuticals, Philadelphia, PA, USA