Background: Atrial fibrillation leads to increased risk of systemic embolism (SE) and stroke. To decrease the occurrence of stroke/SE, anticoagulation is routinely prescribed. Recently, non-vitamin K anticoagulants like apixaban and rivaroxaban have become more popular and are preferred over warfarin. We here compare the efficacy and safety of apixaban with warfarin. Methods: Eligible participants were [...]