1. Department of Neurology; Perelman School of Medicine at the University of Pennsylvania; Philadelphia; PA
2. Avid Radiopharmaceuticals; Philadelphia; PA
3. Departments of Biostatistics and Epidemiology; Perelman School of Medicine at the University of Pennsylvania; Philadelphia; PA
4. Pathology and Laboratory Medicine; Perelman School of Medicine at the University of Pennsylvania; Philadelphia; PA
5. Pathology; University of Washington School of Medicine; Seattle; WA