This was the first time a women's team had been banned from a Women's World Cup, and it was the first time since 1995 that North Korea did not participate in a Women's World Cup. The latest published FIFA Rankings prior to the tournament (March 2015) are shown in brackets. The cities of Vancouver, Edmonton, Winnipeg, Ottawa, Montreal and Moncton were selected to host tournament matches. Halifax was also considered, but removed itself from contention in March 2012. Toronto decided not to bid, due to potential conflicts with the 2015 Pan American Games. Due to FIFA's policy against commercial sponsorship of stadium names, Investors Group Field in Winnipeg and TD Place Stadium in Ottawa were respectively known as Winnipeg Stadium and Lansdowne Stadium during the tournament. Seating capacities shown in table below are as configured for these FIFA games. The tournament introduced goal-line technology with the Hawk-Eye system by which it is possible to show on the stadium screen if the ball was in or not. It was also the first World Cup for either men or women to be played on artificial turf, with all matches played on such surfaces. There were some initial concerns (please see below) over a possible increased risk of injuries from playing on artificial turf, but a legal challenge suggesting matches should be played on grass as in similar men's tournaments was dropped in January 2015. Each team's squad for the 2015 FIFA Women's World Cup consisted of 23 players (three of whom must be goalkeepers), two more than the 2011 tournament, and the same number as men's World Cup squads. Each participating national association was required to confirm its final 23-player squad no later than 10 working days before the start of the tournament. Replacement of seriously injured players was permitted until 24 hours before the team in question's first World Cup game. The squads were officially announced by FIFA on 28 May 2015. Formiga of Brazil and Homare Sawa of Japan were included in World Cup squads for the sixth time, a record for any men or women players. A total of 22 referees, 7 support referees, and 44 assistant referees were selected for the tournament. The draw was held on 6 December 2014 at 12:00 Eastern Standard Time at the Canadian Museum of Nature in Ottawa, Ontario, Canada. The seeding pots were announced the day before. Because UEFA qualified eight teams into the final tournament, which had only six groups, two groups by necessity had to contain two European teams. Otherwise, no group could have more than one team from any confederation. The 24 teams of the tournament were arranged into 6 groups labelled A to F.