[1] Halmstad Univ, Ctr Res Welf Hlth & Sport, Kristian IV S Vag 3, S-30118 Halmstad, Sweden
[2] Karlstad Univ, Fac Hlth Sci & Technol, Univ Gatan 2, S-65188 Karlstad, Sweden
[3] Umea Univ, Dept Psychol, S-90187 Umea, Sweden
[4] Univ Gothenburg, Dept Psychol, Laroverksgatan 5, S-40530 Gothenburg, Sweden