1. Speech and Feeding Disorders Lab; MGH Institute of Health Professions; Charlestown MA USA
2. Program in Speech and Hearing Bioscience and Technology Program, Division of Medical Sciences; Harvard University; Boston MA USA
3. Department of Communication Sciences and Disorders, Bouve College of Health Sciences; Northeastern University; Boston MA USA
4. Department of Neurology; University of Nebraska Medical College; Omaha NE USA
5. Department of Neurology; Massachusetts General Hospital; Boston MA USA
6. Biostatistics Center; Massachusetts General Hospital; Boston MA USA
7. Department of Medicine; Harvard Medical School; Boston MA USA
8. Department of Neurology; Cleveland Clinic Neuromuscular Center; Cleveland OH USA
9. Center for Neurologic Study; La Jolla CA USA