 Group 2 VKA oral anticoagulation: warfarin, which is the control group will receive VKA anticoagulation as before they had the bleeding episode, with regular monitoring by measurement of prothrombin time INR. Patients taking acenocoumarol before bleeding episode will be treated with warfarin and the once who were receiving warfarin will continue with the same treatment. Treatment control is performed by measuring the INR periodically. 