 Complete the following phrase:  As of 2021, 45 official tournaments have been staged. Six nations have won a gold medal and ten have won medals. Historically, the tournament has been dominated by Canada 18 gold medals and the Soviet Union  CIS  Russia 13 gold medals. The USSR won the first four official tournaments, while the Canadians put together five straight championships between 1993 and 1997, and another five straight from 