[1] Univ Florida, Dept Communicat Disorders, Coll Publ Hlth & Hlth Profess, Gainesville, FL 32610 USA
[2] Univ Oklahoma, Hlth Sci Ctr, Coll Allied Hlth, Dept Commun Sci & Disorders, Oklahoma City, OK USA
[3] Towson Univ, Coll Hlth Profess, Dept Audiol Speech Language Pathol & Deaf Studies, Towson, MD USA
[4] Univ Florida, Dept Communicat Sci & Disorders, Gainesville, FL USA