Boys paste stickers in their FIFA World Cup Brazil 2014 albums, after returning from school, in Buenos Aires city, capital of Argentina, on May 6, 2014. Argentine boys collect in their albums the stickers of players from all teams that will compete in the upcoming World Cup. (Xinhua/Martin Zabala)

A boy observes the FIFA World Cup Brazil 2014 sticker album, after returning from school, in Buenos Aires city, capital of Argentina, on May 6, 2014. Argentine boys collect in their albums the stickers of players from all teams that will compete in the upcoming football World Cup. (Xinhua/Martin Zabala)

A boy observes the FIFA World Cup Brazil 2014 sticker album, after returning from school, in Buenos Aires city, capital of Argentina, on May 6, 2014. Argentine boys collect in their albums the stickers of players from all teams that will compete in the upcoming football World Cup. (Xinhua/Martin Zabala)

A boy pastes a sticker of "Fuleco", offical FIFA World Cup Brazil 2014 mascot, in his Worl Cup sticker album, after returning from school, in Buenos Aires city, capital of Argentina, on May 6, 2014. Argentine boys collect in their albums the stickers of players from all teams that will compete in the upcoming football World Cup. (Xinhua/Martin Zabala)