1. School of Natural Sciences and Health, Tallinn University, Tallinn, Estonia
2. Department of Teacher Education, University of Jyväskylä, Jyväskylä, Finland
3. Norwegian Centre for Learning Environment and Behavioural Research in Education, University of Stavanger, Stavanger, Norway
4. Department of Psychology, University of Jyväskylä, Jyväskylä, Finland