[1] Catholic Univ Louvain, Clin Univ St Luc, NEPE, Lab Neurol Dev, B-1200 Brussels, Belgium
[2] Free Univ Brussels, CHU Brugmann, HUDERF, Serv Anatomopathol,Unite Neuropathol, B-1050 Brussels, Belgium
[3] Free Univ Brussels, Hop Univ Enfants Reine Fabiola HUDERF, Serv Pediat, B-1050 Brussels, Belgium
[4] Univ Sherbrooke, Serv Neurol Pediat, CHU Fleurimont, Sherbrooke, PQ J1K 2R1, Canada