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Gold medalist Katinka Hosszu of Hungary celebrates after the women's 400m medley final at the Gwangju 2019 FINA World Championships in Gwangju, South Korea, on July 28, 2019. (Xinhua/Tao Xiyi)

Gold medalist Katinka Hosszu of Hungary celebrates after the women's 400m medley final at the Gwangju 2019 FINA World Championships in Gwangju, South Korea, on July 28, 2019. (Xinhua/Tao Xiyi)