Thanks for the link, Lim. Very interesting stuff. It's clear from Greg’s comments that he believes doping became widespread and pervasive, post 1991-92, or so. In addition, he believes that the impact of this widespread doping is that mediocre riders were elevated to performance levels beyond (non-doping) champions. If his observations are correct, then it’s hard to believe there have been any clean champions since the early 90’s. If mediocre riders on sophisticated doping regimens can surpass non-doping champions, and you accept that at least some of the naturally gifted riders also resorted to doping, what chance would a clean rider have of winning anything under these circumstances?