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Ice hockey tournaments have been staged at the Olympic Games since 1920. The men's tournament was introduced at the 1920 Summer Olympics and was transferred permanently to the Winter Olympic Games programme in 1924. The women's tournament was first held at the 1998 Winter Olympics. The Olympic Games were originally intended for amateur athletes, and until 1998, the players of the National Hockey League (NHL) and other men's professional leagues were not allowed to compete. From 1924 to 1988, the tournament started with a round-robin series of games and ended with the medal round. Medals were awarded based on points accumulated during that round. The games of the tournament follow the rules of the International Ice Hockey Federation (IIHF), which differ slightly from the rules used in the NHL. The tournament follows the World Anti-Doping Agency's (WADA) rules on performance enhancing drugs and the IIHF maintains a Registered Testing Pool, a list of top players who are subjected to random in-competition and out-of-competition drug tests. Several players have tested positive for banned substances since the 1972 Winter Olympics. In July 1992, the IOC voted to approve women's hockey as an Olympic event; it was first held at the 1998 Winter Olympics in Nagano. The United States won the first tournament in 1998, while Canada won in 2002 and 2006.