1. Department of Neurology, MSC 10 5620, 1; University of New Mexico Health Sciences Center; Albuquerque New Mexico 87131 USA
2. Speech, Language, Swallow Center; University of New Mexico Health Sciences Center; Albuquerque New Mexico USA
3. Department of Family and Community Medicine; University of New Mexico Health Sciences Center; Albuquerque New Mexico USA
4. Speech, Language and Hearing Sciences, Center for Respiratory Research & Rehabilitation; University of Florida; Gainesville Florida USA