1. Department of Speech, Language, and Hearing Sciences, Speech and Feeding Disorders Laboratory, Boston University, MGH Institute of Health Professions, Boston, Massachusetts
2. Department of Speech, Language, and Hearing Sciences, Purdue University, West Lafayette, Indiana
3. Department of Communication Disorders, Texas State University, San Marcos, Texas
4. Department of Communicative Sciences and Disorders, Michigan State University, East Lansing, Michigan