[1] Univ Cincinnati, Coll Med, Dept Pediat, Cincinnati Childrens Hosp Med Ctr, Cincinnati, OH USA
[2] Univ Maryland, Med Ctr, Dept Pediat, Baltimore, OH USA
[3] Mayo Clin, Dept Child & Adolescent Neurol, Rochester, MN USA
[4] Mayo Clin, Dept Pediat & Adolescent Med, Rochester, MN USA