1. Speech, Language and Hearing Sciences, Indiana University, Bloomington, IN, USA
2. Speech Pathology, Graduate School of Health, Faculty of Health, University of Technology Sydney, Sydney, Australia
3. Department of Neurology, Johns Hopkins University, Baltimore, MD, USA
4. Arnold School of Public Health, University of South Carolina, Columbia, SC, USA
5. Roxelyn and Richard Pepper Department of Communication Sciences and Disorders, Northwestern University, Evanston, IL, USA