The impact of cognitive load on lower limb biomechanics during the take-off phase before service in tennis players of different levels. - Xuan, Bojie; Sun, Dong; Li, Fengping; Cen, Xuanzhen; Wang, Yucheng; Wang, Dongxu; Chen, Diwei; Zhou, Zhanyi; Li, Zhiyong; Fekete, Gusztáv; Gu, Yaodong (Journal of Sports Sciences, 2026)