In all of these patients FFR (Fractional Flow Reserve) will be performed according to guidelines and stenting will be performed or deferred according to the result of this test. Other techniques, like iFR, IVUS and OCT will be left at the operators' choice and will be recorded. MACE (a composite end point of death, myocardial infarction and target vessel revascularization and stent thrombosis) will be the primary end point, while its single components will be the secondary ones.