Patients will be divided in 3 groups: 1) patients on AST before admission (whether therapy is stopped or continued during hospitalization), 2) patients started on AST during hospitalization but stopped before or at discharge and 3) patients started on AST during hospitalization and continued use after discharge. For patients in group 3, we will describe what the proportion of patients is with use of AST at +1, 3, 6 and 12 months after discharge, therefore group 3 will be subdivided along with these proportions.