<qa>  What is the minimum observation time per patient?What stroke death rates are the result of the use of the following treatment strategies: no anticoagulation with vitamin-k-antagonists VKAs or novel oral anticoagulants NOACs, anticoagulation with VKAs and anticoagulation with NOACs all. What other thromboembolic complication rates resulting from the use of these treatment strategies? What heavy bleeding rates resulting from the defined management strategies? The analysis is based on a data set of patients with atrial fibrillation AF01012010 - 30062014. 2010 is used as the reference period and 01012011-30062013 as the inclusion period. The minimum observation time per patient is 12 months. 