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Jakub Krzewina of team Poland (L) celebrates after winning the men's 4x400m relay final during the IAAF World Indoor Championships at Arena Birmingham in Birmingham, Britain on March 4, 2018. (Xinhua/Tim Ireland)

Jakub Krzewina of team Poland (L) celebrates after winning the men's 4x400m relay final during the IAAF World Indoor Championships at Arena Birmingham in Birmingham, Britain on March 4, 2018. (Xinhua/Tim Ireland)