1. Department of Computer Science and Media Technology, Linnaeus University, 352 52 Växjö, Sweden
2. Faculty of Computer Science, University of New Brunswick, Fredericton, NB E3B 5A3, Canada
3. Department of Learning, Informatics, Management and Ethics, Karolinska Institutet, 171 77 Solna, Sweden
4. Department of Pedagogy and Learning, Linnaeus University, 352 52 Växjö, Sweden