Efficacy and safety of apixaban compared with warfarin according to patient risk of stroke and of bleeding in atrial fibrillation: a secondary analysis of a randomized controlled trial
Lancet 380:1749-1758, Lopes, R.,et al, 2012
Bleeding During Treatment with Aspirin Versus Apixaban in Patients with Atrial Fibrillation Unsuitable for Warfarin
Stroke 43:3291-3297, Flaker, G.,et al, 2012