Doping-related cases among Russian athletes...

"Before going to the Olympics all athletes undergo a three- or four-staged [doping] test in laboratories. But unfortunately the experience of previous Olympic Games casts doubt that the athletes who left our country "clean" will continue behaving the same way [there]," Igor Vykhodets, a senior medical official at the Russian Medical Biological Agency, said.

His statement comes in the wake of Russian female skier Alyona Sidko"s disqualification over doping-use charges.

The Russian skiing federation has disqualified Sidko, the 2006 Olympic bronze medalist, for two years and excluded her from the national Olympic team after she tested positive for the use of doping at a Russian skiing competition last month.

Russian athletes have been recently plagued by doping-related cases and subsequent disqualifications. Last month, the International Ski Federation (FIS) alone disqualified two Russian female skiers, Yulia Chepalova and Natalia Matveyeva, on accusations of doping

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