sentences:  They reconstructed the data on the basis of the balance sheets of the Eurosystem's national central banks and the balance-sheet statistics of the International Monetary Fund.Later, in June 2011, Hans-Werner Sinn and Timo Wollmershaeuser compiled the first panel database of the Eurozone's TARGET balances.The authors point out that the additional creation of money by the central banks of the crisis-stricken countries was provided by a lowering of the standards for the collateral that commercial banks have to provide to their national central banks to obtain refinancing credit.