1. Department of Pediatrics, Washington University School of Medicine, St. Louis, Missouri
2. Departments of Neurology and Radiology, Washington University School of Medicine, St. Louis, Missouri
3. Department of Neurological Surgery, Washington University School of Medicine, St. Louis, Missouri
4. Department of Neurology, University of North Carolina School of Medicine, Chapel Hill, North Carolina
5. Department of Anatomy and Neurobiology, Washington University School of Medicine, St. Louis, Missouri
6. Department of Medicine, Washington University School of Medicine, St. Louis, Missouri