The Autism Genetics Cooperative: Canagen: SEB, JB, X-QL, ADP, WR, PS, SWS, APT, and LZ; AGC Data Coordinating Center (Battelle Center for Mathematical Medicine, The Research Institute at Nationwide Children's Hospital): CBa and VJV; Miami Institute for Human Genomics: MLC, JRG, and MAP-V; Paris Autism Research International Sibpair (PARIS) Study: CBe, CG, and MLe; Seaver Autism Research Center: JDB and KLD; Stanford University: JH and LL; Vanderbilt University: JLH and JSS; University of North Carolina/University of Iowa: JP, VS, and THW.