1. Department of Neurology; University of Pennsylvania; Philadelphia Pennsylvania
2. Penn Image Computing and Science Lab, Department of Radiology; University of Pennsylvania; Philadelphia Pennsylvania
3. Department of Neurology; Georgetown University; Washington DC
4. Research Division; MedStar National Rehabilitation Hospital; Washington DC
5. Department of Radiology and Medical Imaging; University of Virginia, Virginia
6. Language and Aphasia Lab, Moss Rehabilitation Research Institute; Elkins Park Pennsylvania
7. Department of Radiology; University of Pennsylvania; Philadelphia Pennsylvania