1. Department of Communication DisordersBrigham Young University, Provo; the Division of RheumatologySalt Lake CityUtah U.S.A.
2. Department of Health ScienceBrigham Young University, Provo; the Division of RheumatologySalt Lake City, Utah U.S.A.
3. Division of RespiratoryCritical Care and Occupational Pulmonary MedicineSalt Lake CityUtah U.S.A.
4. George E. Wahlen Department of Veterans Affairs Medical CenterSalt Lake CityUtah U.S.A.
5. Division of OtolaryngologyHead and Neck Surgery, The University of Utah School of MedicineSalt Lake CityUtah U.S.A.
6. Department of Communication Sciences and DisordersThe University of UtahSalt Lake CityUtah U.S.A.