[1] COLUMBIA UNIV COLL PHYS & SURG, DIV PEDIAT NEUROL, NEW YORK, NY 10032 USA
[2] IST NEUROL C BESTA, I-20133 MILAN, ITALY
[3] VANCOUVER GEN HOSP, VANCOUVER V5Z 1M9, BC, CANADA
[4] UNIV WISCONSIN, CTR CLIN GENET, MADISON, WI 53706 USA
[5] ST JOSEPHS HOSP & MED CTR, BARROW NEUROL INST, PHOENIX, AZ 85013 USA