[1] Cleveland Clin, Lerner Coll Med, Cleveland, OH 44106 USA
[2] Childrens Hosp Pittsburgh, Dept Pediat Neurol, Pittsburgh, PA 15213 USA
[3] Cleveland Clin, Dept Neurol, Mellen Ctr, Cleveland, OH 44106 USA
[4] Cleveland Clin, Neurol Inst, Ctr Pediat Neurol, 9500 Euclid Ave,S60, Cleveland, OH 44195 USA