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Left to right, Vitor Constancio, vice president of the European Central Bank (ECB), Ewald Nowotny, governor of Austria's central bank and European Central Bank governing council member, Mario Draghi, president of the European Central Bank, and Christine Graeff, director general for communications at the European Central Bank, react during a news conference to announce the bank's interest rate decision in Vienna, Austria, on Thursday, June 2, 2016. The European Central Bank kept its stimulus program unchanged and said it will start buying corporate bonds next week, as measures announced two months ago kick in. Photographer: Krisztian Bocsi/Bloomberg via Getty Images