1. Department of Neurological Surgery, University of California, San Francisco;
2. Pediatric Stroke and Cerebrovascular Disease Center, Department of Neurology, University of California, San Francisco;
3. Center for Cerebrovascular Research, Department of Anesthesia and Perioperative Care, University of California, San Francisco;
4. Department of Radiology and Biomedical Imaging, University of California, San Francisco;
5. Department of Neurosurgery, Barrow Neurological Institute, Phoenix, Arizona
6. Department of Pediatrics, University of California, San Francisco, California; and