[1] Med Univ Silesia, Fac Med Sci Katowice, Dept Pediat Pediat Obes & Metab Bone Dis, PL-40055 Katowice, Poland
[2] Univ Bielsko Bia, Inst Pedag, PL-43309 Bielsko Biala, Poland
[3] Med Univ Silesia, Sch Hlth Sci Katowice, Dept Psychol, Chair Social Sci & Humanities, PL-40055 Katowice, Poland
[4] Anglia Ruskin Univ, Sch Psychol & Sport Sci, Cambridge CB1 1PT, Cambs, England
[5] Perdana Univ, Ctr Psychol Med, Kuala Lumpur 50490, Malaysia