[1] Kennedy Krieger Inst, Ctr Autism & Related Disorders, Baltimore, MD 21211 USA
[2] Johns Hopkins Univ, Sch Med, Dept Psychiat & Behav Sci, Baltimore, MD 21205 USA
[3] Georgetown Univ, Dept Psychol, Washington, DC 20057 USA
[4] Johns Hopkins Univ, Sch Med, Baltimore, MD USA
[5] Kennedy Krieger Inst, Ctr Neurodev & Imaging Res, Baltimore, MD USA
[6] Johns Hopkins Univ, Sch Med, Dept Neurol, Baltimore, MD 21205 USA