[1] Harvard Med Sch, Boston Childrens Hosp, Dept Neurol, Div Epilepsy & Clin Neurophysiol, Boston, MA USA
[2] Free Univ Brussels, Erasmus Hosp, Dept Neurol, Brussels, Belgium
[3] Univ Austral Chile, Fac Med, Valdivia, Chile
[4] Univ Barcelona, Hosp St Joan de Deu, Dept Child Neurol, Barcelona, Spain