[1] Univ Goettingen, Inst Languages, Gottingen, Germany
[2] United Arab Emirates Univ, Special Educ Dept, Al Ain, U Arab Emirates
[3] Kwame Nkrumah Univ Sci & Technol, Dept Sociol & Social Work, Kumasi, Ghana
[4] Sch Educ, Penrith, Australia
[5] Univ Western Sydney, Penrith, Australia
[6] Kwame Nkrumah Univ Sci & Technol, Dept Disabil & Educ, Kumasi, Ghana
[7] Univ Canterbury, Dept Educ Studies & Leadership, Christchurch, New Zealand
[8] United Arab Emirates Univ, Dept Speech Language Pathol, Al Ain, U Arab Emirates
[9] United Arab Emirates Univ, Special Educ Dept, POB 15551, Al Ain, U Arab Emirates