Information on major and minor bleedings during oral anticoagulation will be collected in the whole sample. Major bleedings will be defined as hemorrhages that were either retroperitoneal or intracranial or associated with a decrease in hemoglobin of at least 2.0 g per deciliter or that had required either transfusion of at least 2 units of blood (or of red cells) or an invasive procedure, including surgery, to stop them or if they warranted permanent OAT withdrawing.