title: In defense of lumping (and splitting).
authors.forename: William P L
authors.initials: WP
authors.lastname: Mandy
authors.forename: David H
authors.initials: DH
authors.lastname: Skuse
authors.forename: Tony
authors.initials: T
authors.lastname: Charman
authors.forename: Thomas W
authors.initials: TW
authors.lastname: Frazier
mesh_terms: D002659:Child Development Disorders, Pervasive / Q000145:classification* / Q000175:diagnosis*; D039721:Diagnostic and Statistical Manual of Mental Disorders; D005260:Female; D006801:Humans; D008297:Male; D012042:Registries