[1] UCL, Dept Paediat & Child Hlth, Royal Free & Univ Coll, Sch Med, London WC1E 6JJ, England
[2] Med Univ Vienna, Dept Psychiat, Vienna, Austria
[3] Univ Groningen, Med Ctr, Dept Neurol, NL-9700 RB Groningen, Netherlands
[4] Aghia Sophia Childrens Hosp, Dept Neurol, Athens 11527, Greece
[5] Hop St Vincent de Paul, F-75674 Paris 14, France
[6] Columbia Univ, Div Stat Genet, New York, NY 10032 USA
[7] Uppsala Univ, Dept Womens & Childrens Hlth, Uppsala, Sweden
[8] Med Univ Vienna, Dept Paediat, Vienna, Austria
[9] Odense Univ Hosp, Dept Neurol, Epilepsy Clin, DK-5000 Odense C, Denmark
[10] Sygehus Vestsjaelland, Dept Neurol, DK-4300 Holbaek, Denmark
[11] Univ Bonn, Clin Epileptol, Bonn, Germany
[12] Univ Bonn, Inst Human Genet, Bonn, Germany
[13] Univ Helsinki, Biomedicum Helsinki, Folkhalsan Inst Genet, FIN-00014 Helsinki, Finland
[14] Univ Helsinki, Ctr Neurosci, FIN-00014 Helsinki, Finland
[15] Queen Silvia Childrens Hosp, Neuropaediat Unit, S-41685 Gothenburg, Sweden
[16] Max Delbruck Ctr Mol Med, Gene Mapping Ctr, D-13125 Berlin, Germany
[17] Tampere Univ Hosp, Dept Paediat, Tampere, Finland