1. Stanford University School of Medicine, Stanford;
2. Department of Neurosurgery, Stanford University School of Medicine, Stanford, California;
3. Department of Neurosurgery, Wright State University Boonshoft School of Medicine, Dayton, Ohio;
4. Division of Pediatric Neuroradiology, Department of Radiology, Lucile Packard Children’s Hospital, Stanford University School of Medicine, Stanford, California;
5. Division of Pediatric Neurosurgery, Department of Neurosurgery, University of Utah, Salt Lake City, Utah; and
6. Division of Pediatric Neurosurgery, Department of Neurosurgery, Lucile Packard Children’s Hospital, Stanford University School of Medicine, Stanford, California