Lance Armstrong, Ben Johnson & Marion Jones - famous drug cheats
BBC Sport takes a look at some of sport's famous drugs cheats following a study into the long-term effects of doping.
Research by scientists at the University of Oslo suggests certain drugs can remain in an athlete's system for decades, meaning they could still be benefiting from their effects years later.
Athletes featured include, seven-time Tour de France winner Lance Armstrong, Canadian sprinter Ben Johnson and Britain's Dwain Chambers.
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