 Complete the following phrase:  Vera has been an international referee since 2006. He has officiated matches in FIFA World Cup qualifiers, the Copa Libertadores, the Copa Sudamericana and the South American Youth Football Championship. He was selected as a referee for the 2011 Copa América in Argentina and the 2015 Copa America in Chile. In addition, he was appointed by FIFA to take charge of matches at the 2012 FIFA Club World Cup and the 2014 FIFA World Cup. He was selected as the fourth official for the 