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The 13th IAAF World Championships in Athletics was an international athletics competition that was held in Daegu, South Korea. It started on 27 August 2011 and finished on 4 September 2011. The United States topped the medal standings in the competition with 25. During the competition, 41 national records, 4 area records, 3 championship records, and 1 world record was set. (via Freebase)