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Considering that there is less than 0.5% difference in times between the top ten riders, it obviously doesn't need much of an improvement to make doping worthwhile. I have heard one opinion on the use of growth hormone that there might be a 1-2% improvement from using an undetectable amount, which in the Olympics is the difference between not making the final and a medal, and it wouldn't be surprising if there is an undetectable level of EPO that produces similar results.

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