[Piggybank painted in colours of Greek flag stands amongst various euro coins in this picture illustration taken in Berlin]By Renee Maltezou ATHENS (Reuters) - Greece and its international lenders were edging closer to a compromise on signing off on a review of bailout reforms which could unlock more aid to the country, government sources said on Monday, after marathon talks with creditors. Just over ten hours of overnight negotiations between Athens and its lenders - the European Commission, the European Central Bank, European Stability Mechanism and the International Monetary Fund - broke off shortly before 0400 GMT. The review has dragged on for months mainly due to a rift among the lenders over Greece's projected fiscal shortfall by 2018 - initially seen at 3 percent by the EU, 1 percent by Athens and 4.5 percent by the IMF.