1. Communication Sciences & Disorders, Northern Arizona University, Flagstaff, USA,
2. Department of Communication Sciences & Disorders, The University of North Carolina at Greensboro, Greensboro, USA,
3. Department of Mathematics and Statistics, The University of North Carolina at Greensboro, Greensboro, USA,
4. Communication Sciences & Disorders, Appalachian State University, Boone, USA, and
5. Center for Biotechnology, Genomics & Health Research, The University of North Carolina at Greensboro, Greensboro, USA