1. Faculty of Educational Sciences, University of Bielefeld, Bielefeld, Germany
2. Research and Development Center, University of Applied Sciences of Special Needs Education Zurich, Zurich, Switzerland
3. Department of Education, University of Vienna, Vienna, Austria
4. Research Focus Area Optentia, North-West University, Vanderbijlpark, South Africa
5. Faculty of Rehabilitation Science, Technical University Dortmund, Dortmund, Germany