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epa04949131 Matthias Mueller, new chief executive of Volkswagen AG, attends a press conference at the VW factory in in Wolfsburg, Germany, 25 September 2015. Volkswagen on 25 September 2015 named Mueller as the successor of Winterkorn as Volkswagen group chairman. Winterkorn on 23 September resigned as chairman of the board after a crisis meeting, as Europe's biggest carmaker struggles to respond to a deepening emissions testing scandal. EPA/JULIAN STRATENSCHULTE