1. Departments of Neurology and Neurobiology, The David Geffen School of Medicine at UCLA, Los Angeles, California.
2. Division of Pediatric Neurology, Mattel Children's Hospital–UCLA, Los Angeles, California.
3. Department of Neurosurgery, The David Geffen School of Medicine at UCLA, Los Angeles, California.
4. Department of Molecular and Medical Pharmacology, The David Geffen School of Medicine at UCLA, Los Angeles, California.