[1] Harvard Univ, Massachusetts Gen Hosp, Div Gen Pediat, Dept Pediat, Boston, MA 02115 USA
[2] Harvard Univ, Harvard Med Sch, Boston, MA 02115 USA
[3] Childrens Hosp Philadelphia, Appl Clin Res Ctr, Philadelphia, PA 19104 USA
[4] Univ Penn, Perelman Sch Med, Philadelphia, PA 19104 USA
[5] Kennedy Krieger Inst, Dept Med Informat, Baltimore, MD USA
[6] Ohio State Univ, Dept Pediat, Nationwide Childrens Hosp, Dev & Behav Pediat, Columbus, OH 43210 USA
[7] Johns Hopkins Med, Dept Pediat, Baltimore, MD USA
[8] Cincinnati Childrens Hosp, Autism Speaks, Dept Sci, Div Dev & Behav Pediat, Boston, MA USA