title: Commentary - Autism Spectrum Disorder: Spectrum or Cluster?
authors.affiliation: Department of Psychiatry, Washington University School of Medicine, St. Louis, Missouri.
authors.forename: John R
authors.initials: JR
authors.lastname: Pruett
authors.affiliation: Department of Biology, University of Louisiana at Lafayette, Lafayette, Louisiana.
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Povinelli