1. Department of Communication Sciences and Disorders, University of South Carolina, Columbia, SC, USA
2. Communication Science and Disorders, VA Pittsburgh Healthcare System, Pittsburgh, PA, USA
3. Department of Communication Science and Disorders, University of Pittsburgh, Pittsburgh, PA, USA
4. Department of Linguistics and Languages, McMaster University, Hamilton, ON, Canada
5. Department of Educational Psychology, University of Illinois at Urbana-Champaign, Champaign, IL, USA