In pics: winners of women's 4x400m relay final at IAAF World Indoor Championships

(From L to R)Team US' Georganne Moline, Shakima Wimbley, Courtney Okolo and Quanera Hayes celebrate after winning the women's 4x400m relay final during the IAAF World Indoor Championships at Arena Birmingham in Birmingham, Britain on March 4, 2018. (Xinhua/Han Yan)