[1] Chaim Sheba Med Ctr, Danek Gartner Inst Human Genet, IL-52621 Tel Hashomer, Israel
[2] Chaim Sheba Med Ctr, Heller Inst Med Sci, IL-52621 Tel Hashomer, Israel
[3] Chaim Sheba Med Ctr, Paediat Neurol Unit, IL-52621 Tel Hashomer, Israel
[4] Shearey Zedek Med Ctr, Paediat Neurol Unit, IL-81031 Jerusalem, Israel
[5] Hosp Sick Children, Div Neurol, Toronto, ON M5G 1X8, Canada
[6] NIAMSD, Arthrit & Rheumatism Branch, NIH, Bethesda, MD 20892 USA