1. Physical Activity, Physical Education, Sport and Health (PAPESH) Research Centre, Sports Science Department, School of Social Sciences, Reykjavik University, Reykjavík, Iceland
2. Psychology Department, School of Social Sciences, Reykjavik University, Reykjavík, Iceland
3. Faculty of Medicine, School of Health Sciences, University of Iceland, Reykjavík, Iceland
4. Landspitali – The National Hospital of Iceland, Reykjavík, Iceland