Cleared Russian athletes were allowed to participate as "Olympic Athletes from Russia" (OAR). Sports are ranked by number of athletes. There are many known cases of doping in sports with stanozolol by professional athletes. There are known cases of doping in sports with trenbolone acetate by professional athletes. There are known cases of doping in sports with trenbolone esters by professional athletes. Many competitive organizations are available for special needs student athletes. This included all medalists and all of the 170 Russian athletes. World Athletics also has rules for intersex/differences of sex development (DSD) athletes. Over 65% of the competing athletes were Greek. These facilities serve as the primary training venues for a number of competitive athletes. She became one of the first Nike Elite Dance Athletes in 2005. He comes from a family of collegiate athletes. Professionals in Korea achieved a status similar to professional athletes. Cases of doping with oxandrolone by professional athletes have been reported. This risk has been recorded as being nearly 1 out of every 4 young athletes.