title: Interpreting PRO: from strategy to structure.
authors.affiliation: Department of Communication Disorders, William Paterson College of New Jersey, Wayne 07470.
authors.forename: J R
authors.initials: JR
authors.lastname: Hsu
authors.forename: H S
authors.initials: HS
authors.lastname: Cairns
mesh_terms: D002648:Child; D002675:Child, Preschool; D006801:Humans; D007804:Language Development; D008037:Linguistics