[1] Royal Hosp, Pediat, Muscat, Oman
[2] Univ Toronto, Hosp Sick Children, Neurol, Toronto, ON, Canada
[3] Univ Toronto, Hosp Sick Children, Neurol Neurophysiol, Toronto, ON, Canada
[4] Univ Toronto, Hosp Sick Children, Neurosurg, Toronto, ON, Canada