IAAF President Lamine Diack speaks during the closing ceremony of the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing, capital of China, Aug. 30, 2015. (Xinhua/Li Gang)

Children perform during the closing ceremony of the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing, capital of China, Aug. 30, 2015. (Xinhua/Yue Yuewei)

British team captain Martyn Rooney (2nd R) waves the IAAF flag on behalf of 2017 host city London during the closing ceremony of the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing, capital of China, Aug. 30, 2015. (Xinhua/Li Gang)

Chinese Athletic Association president Duan Shijie waves the IAAF flag during the closing ceremony of the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing, capital of China, Aug. 30, 2015. (Xinhua/Yue Yuewei)

Mayor of Beijing, Wang Anshun speaks during the closing ceremony of the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing, capital of China, Aug. 30, 2015. (Xinhua/Li Gang)

Women's 20km race walk gold medalist, Chinese athlete Liu Hong (3rd L) waves the IAAF flag during the closing ceremony of the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing, capital of China, Aug. 30, 2015. (Xinhua/Yue Yuewei)

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