1. Department of Logopedics and Phoniatrics, Karolinska Institute, Stockholm, Sweden.
2. Department of Speech and Hearing Science, University of Illinois at Urbana-Champaign, Urbana, Illinois.
3. Speech and Language Therapy Department, Great Ormond Street Hospital for Children NHS Trust, London, United Kingdom.
4. Speech and Language Therapy Department, The Children's University Hospital, Dublin, Ireland, and University of Limerick, Limerick, Ireland.
5. Department of Communication Disorders and Sciences, California State University at Northridge, Northridge, California.
6. Division of Speech and Hearing Sciences, University of Hong Kong, Hong Kong.