title: Psychiatric diagnosis in preschool children.
authors.forename: Jon M
authors.initials: JM
authors.lastname: McClellan
authors.forename: Matthew L
authors.initials: ML
authors.lastname: Speltz
mesh_terms: D001289:Attention Deficit Disorder with Hyperactivity / Q000453:epidemiology; D002675:Child, Preschool; D015897:Comorbidity; D006801:Humans; D001523:Mental Disorders / Q000175:diagnosis / Q000453:epidemiology*; D011569:Psychiatric Status Rating Scales; D015203:Reproducibility of Results