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Lin Wenyi,front left,chairman of Beijing Olympic Scientific Technology Committe and Yang Shuan, vice executive president of the Beijing Organizing Committee for the Games of the XXIX Olympiad (BOCOG) attend the anti-doping exhibition in Beijing January 17, 2007. China now has a lower number of doping cases than the international average, but the use of banned substances is spreading from elite athletes to the general population, a Beijing Olympics official said on Wednesday. [Xinhua]

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