[1] Womens & Childrens Hosp, Dept Cytogenet & Mol Genet, Ctr Med Genet, Adelaide, SA 5006, Australia
[2] Univ Melbourne, Austin & Repatriat Med Ctr, Dept Med Neurol, Heidelberg, Vic, Australia
[3] Neurol Inst, London, England
[4] Royal Hallamshire Hosp, Sheffield S10 2JF, S Yorkshire, England
[5] Royal Hosp Sick Children, Glasgow G3 8SJ, Lanark, Scotland
[6] Univ Bologna, Inst Clin Neurol, Bologna, Italy
[7] Univ Uppsala, Childrens Hosp, Child Neurol Unit, Uppsala, Sweden
[8] Montreal Neurol Hosp & Inst, Montreal, PQ H3A 2B4, Canada
[9] Univ Adelaide, Dept Genet, Adelaide, SA, Australia