MADRID/FRANKFURT (Reuters) - The European Central Bank is ready to take further measures to support the crisis-stricken euro zone economy, it said on Wednesday, attempting to dispel growing concerns that the bank is out of ammunition.While the ECB agreed on wide range of stimulus measures last week, markets have questioned whether it has any potent tools left should the coronavirus crisis deepen and the bank is called upon once again.These concerns were reinforced by Austrian central bank chief..