Accepted for Publication: January 28, 2013.
Published Online: April 29, 2013. doi:10.1001/jamaneurol.2013.247
Author Contributions:Study concept and design: Liew, Darras, De Vivo, and Chung. Acquisition of data: Liew, Darras, Prabhu, and De Vivo. Analysis and interpretation of data: Liew, Ben-Omran, Darras, Prabhu, De Vivo, Vatta, Yang, and Eng. Drafting of the manuscript: Liew, Darras, and Chung. Critical revision of the manuscript for important intellectual content: Liew, Ben-Omran, Darras, Prabhu, De Vivo, Vatta, Yang, and Eng. Administrative, technical, and material support: Liew, Prabhu, Yang, and Eng. Study supervision: Ben-Omran, Darras, De Vivo, and Chung.
Conflict of Interest Disclosures: Dr Prabhu reports receiving funding from the National Institutes of Health, the National Institute of Mental Health, the Department of Defense, and the Innovation Acceleration Program, Boston Children's Hospital. Dr De Vivo reports serving as a consultant to ISIS Pharmaceuticals and receiving funding from the National Institutes of Health and the Department of Defense.