[1] Univ Sherbrooke, Dept Pediat, Serv Neuropediat, CHUS, Sherbrooke, PQ J1H 5N4, Canada
[2] CHU Montpellier, Serv Neuropediat, Montpellier, France
[3] Univ Dusseldorf, Childrens Hosp, D-4000 Dusseldorf, Germany
[4] Heidelberg Univ, Childrens Hosp, D-6900 Heidelberg, Germany
[5] Univ Zurich, Childrens Hosp, Zurich, Switzerland
[6] Klin Kinder, Angsburg, Germany