1. Department of Sport Science and Physical Education, University of Agder, Kristiansand, Norway
2. Physical Activity, Physical Education, Sport and Health Research Centre, Reykjavik University, Reykjavík, Iceland
3. Faculty of Kinesiology, University of Split, Split, Croatia
4. HB Statz, Seltjarnarnes, Iceland
5. Center of Research on Welfare, Health and Sport, Halmstad University, Halmstad, Sweden