Pumped up: Bjarne Riis is pictured here in his yellow leader's jersey during the 1996 Tour De France

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World cycling chiefs have called on Bjarne Riis, Denmark's only winner of the Tour de France, to hand back the yellow jersey he won in 1996 after the cyclist ended years of speculation over his involvement in doping by admitting on Friday that he had used the banned blood booster EPO (erythropoietin) between 1993 and 1998 while racing with Telekom.

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