[1] Univ Southern Calif, Dept Neurol, Los Angeles, CA 90007 USA
[2] Univ Southern Calif, Dept Populat & Publ Hlth Sci, Los Angeles, CA USA
[3] Univ Pittsburg Med Ctr UPMC, Dept Pediat, Childrens Hosp Pittsburgh, Pittsburgh, PA USA
[4] Univ Cincinnati, Div Gen & Community Pediat, Coll Med, Cincinnati, OH USA
[5] Univ Cincinnati, Dept Pediat, Cincinnati Childrens Hosp Med Ctr, Coll Med, Cincinnati, OH USA
[6] Univ Calif San Francisco, Ctr Hlth & Community, San Francisco, CA USA
[7] Columbia Univ, Dept Neurol, Vagelos Coll Phys & Surg, New York, NY USA
[8] Northwestern Univ, Dept Neurol, Chicago, IL USA