[1] OREGON HLTH SCI UNIV, DEPT MOL & MED GENET, PORTLAND, OR 97201 USA
[2] OREGON HLTH SCI UNIV, DEPT NEUROL, PORTLAND, OR 97201 USA
[3] BAYLOR COLL MED, DEPT NEUROL, HOUSTON, TX 77030 USA
[4] IST NAZL NEUROL CARLO BESTA, DEPT CHILD NEUROL, I-20133 MILAN, ITALY
[5] AUCKLAND HOSP, NEUROSERV UNIT, AUCKLAND 1, NEW ZEALAND
[6] HOSP SAN JUAN DIOS, DEPT NEUROPEDIAT, BARCELONA 08034, SPAIN
[7] KYOTO UNIV, SCH MED, DEPT PEDIAT, KYOTO 606, JAPAN
[8] ADELAIDE CHILDRENS HOSP INC, DEPT PEDIAT, ADELAIDE, SA 5006, AUSTRALIA
[9] BAMBINO GESU PEDIAT HOSP, NEUROPHYSIOL UNIT, I-00165 ROME, ITALY