1. Departments of Neurology,
2. Department of Medical Imaging, St. Michael's Hospital, Toronto, Ontario, Canada;
3. Neurological Surgery,
4. Graduate Program in Bioengineering, University of California, Berkeley/University of California, San Francisco, California; and
5. Epidemiology and Biostatistics, and
6. Institute of Advanced Biomedical Technologies, University G. D'Annunzio, Chieti, Italy
7. Radiology and Biomedical Imaging, University of California, San Francisco, California;