Question: What was the country of origin of one of the major users of Butterfly style in 1980's hockey?

<P0-S0> Anthony James "Tony O" Esposito (born April 23, 1943) is a retired Canadian-American professional ice hockey goaltender, who played in the National Hockey League, most notably for the Chicago Black Hawks. <P0-S1>  He was one of the pioneers of the now popular butterfly style. <P0-S2>  Tony is the younger brother of Phil Esposito, a centre. <P0-S3>  Both brothers had notable careers and are enshrined in the Hockey Hall of Fame. <P0-S4>  On January 27, 2017, in a ceremony during the All-Star Weekend in Los Angeles, Esposito was part of the second group of players to be named one of the '100 Greatest NHL Players' in history. <SEP> <P1-S0> Roberto Luongo ( ; born April 4, 1979) is a Canadian professional ice hockey goaltender for the Florida Panthers of the National Hockey League (NHL). <P1-S1>  Born in Montreal, Quebec, he is of Italian and Irish ancestry. <P1-S2>  He employs the butterfly style of goaltending and has previously played in the NHL for the New York Islanders and the Vancouver Canucks. <P1-S3>  Luongo is a two-time NHL Second All-Star (2004 and 2007) and a winner of the William M. Jennings Trophy for backstopping his team to the lowest goals-against average in the league (2011; with backup Cory Schneider). <P1-S4>  He has additionally been a finalist for the Vezina Trophy as the league's best goaltender (2004, 2007 and 2011), the Lester B. Pearson Award as the top player voted by his peers (2004 and 2007) and the Hart Memorial Trophy as the league's most valuable player (2007). <SEP> <P2-S0> Patrick Jacques Roy (] ; born October 5, 1965) is a Canadian former professional ice hockey goaltender and the former head coach and vice-president of hockey operations for the Colorado Avalanche of the National Hockey League (NHL). <P2-S1>  He is regarded as one of the greatest goaltenders of all time. <P2-S2>  On January 27, 2017, in a ceremony during the All-Star Weekend in Los Angeles, Roy was part of the second group of players to be named one of the '100 Greatest NHL Players' in history. <P2-S3>  Patrick is the brother of Stéphane Roy. <SEP> <P3-S0> In ice hockey, "butterfly style" is a technique of goaltending distinguished by the goaltender guarding the lower part of the net by dropping to the knees to block attempts to score. <P3-S1>  The butterfly style derives its name from the resemblance of the spread goal pads and hands to a butterfly's wings. <P3-S2>  The "butterfly style" is contrasted with stand-up style, where most shots on a goal are stopped with the goaltender on their feet. <P3-S3>  Many factors helped make it a "de facto" standard style of play today, including the popularization of the goalie mask by Jacques Plante, Vladislav Tretiak's outstanding use of the style at the 1972 Canada–USSR Summit Series, the National Hockey League (NHL) emergence of Tony Esposito in the 1970s and Patrick Roy in the 1980s, the development of lightweight materials for pads and the influence of professional goaltending coaches such as Warren Strelow, Benoit and François Allaire. <P3-S4>  There are few who exclusively employ a stand-up style in the NHL.