1. Department of Educational and Developmental Psychology, Institute of Psychology, Leiden University, 2333 AK Leiden, The Netherlands
2. Departamento de Desporto e Saúde, Escola de Saúde e Desenvolvimento Humano, Universidade de Évora, 7004-516 Évora, Portugal
3. Comprehensive Health Research Centre (CHRC), Universidade de Évora, 7004-516 Évora, Portugal
4. Department of Human Media Interaction, Faculty of Electrical Engineering, Mathematics and Computer Science, University of Twente, 7522 NB Enschede, The Netherlands
5. Department of Psychology and Human Development, Institute of Education, University College London, London WC1E 6BT, UK
6. Department of Educational Sciences, Institute of Education and Child Studies, Leiden University, 2333 AK Leiden, The Netherlands