1 Departments of Neurology and Pediatrics, Benioff Children's Hospital San Francisco, University of California San Francisco, San Francisco, California. Electronic address: dawn.gano@ucsf.edu.
2 Departments of Neurology and Pediatrics, Children's Hospital of Philadelphia, Perelman School of Medicine at University of Pennsylvania, Philadelphia, Pennsylvania.
3 Departments of Pediatrics and Neurology, Weill Cornell Medical College, Memorial Sloan Kettering Cancer Center, New York, New York.