Chinese athletes regularly failed dope tests after the country returned to the Olympic fold in the early 1980s but there was a concerted effort by the government to crack down on the use of banned substances ahead of the 2008 Beijing Olympics

WADA to investigate claims of doping in China

These results may pile pressure on the IOC to make the unprecedented move of banning an entire country from the 2016 Games for doping

IOC finds 45 new doping failures from Beijing, London Games

Document about a further decision is yet to come, but medals will be taken away from Marina Shainova and Nadezhda Evstyukhina

Two Russian Olympic weightlifting medalists fail doping tests