1 Division of Neurosurgery (Ibrahim, Rutka) and Division of Neurology (Snead), Hospital for Sick Children; Department of Surgery (Ibrahim, Rutka) and Institute of Medical Science (Ibrahim, Snead), University of Toronto, Toronto, Ont.
2 Division of Neurosurgery (Ibrahim, Rutka) and Division of Neurology (Snead), Hospital for Sick Children; Department of Surgery (Ibrahim, Rutka) and Institute of Medical Science (Ibrahim, Snead), University of Toronto, Toronto, Ont. carter.snead@sickkids.ca.