1. Department of Otolaryngology, University of Iowa Hospitals and Clinics, Iowa City, IA, USA;
2. Department of Communications Sciences and Disorders, University of Iowa, Iowa City, IA, USA;
3. Center for Disabilities and Development, University Iowa Hospitals and Clinics, Iowa City, IA, USA;
4. Department of Neurology, University of Iowa Hospitals and Clinics, Iowa City, IA, USA