Edited by Daniel Laskowitz, MD, MHS, professor of neurology, anesthesiology & neurobiology; and director, Neurovascular Laboratories, Duke University Medical Center, Durham, North Carolina, USA Gerald A. Grant, MD, FACS, division chief, Pediatric Neurosurgery; vice chair for pediatric neurosurgery and associate program director; and associate professor, Department of Neurosurgery; Stanford University/Lucile Packard Children's Hospital, California, USA