[1] Univ Alberta, Fac Rehabil Med, Edmonton, AB, Canada
[2] Univ Alberta, Fac Rehabil Med, Inst Stuttering Treatment & Res ISTAR, Edmonton, AB, Canada
[3] Univ Alberta, Fac Rehabil Med, Dept Phys Therapy, Edmonton, AB, Canada
[4] Univ Alberta, Fac Rehabil Med, Rehabil Res Ctr, Edmonton, AB, Canada
[5] Univ Alberta, Fac Rehabil Med, Dept Commun Sci & Disorders, Edmonton, AB, Canada
[6] Dalhousie Univ, Fac Hlth, Sch Occupat Therapy, Halifax, NS, Canada
[7] Univ Alberta, Fac Rehabil Med, Inst Stuttering Treatment & Res ISTAR, 8205 114 St,3-48 Corbett Hall, Edmonton, AB T6G 2G4, Canada