1. Division of Child Neurology, Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, United States
2. Department of Neurology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States
3. Division of Neuroradiology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, United States
4. Department of Radiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States
5. Department of Pediatric Hematology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, United States