Relation of risk of stroke in patients with atrial fibrillation to body mass index (from patients treated with Rivaroxaban and Warfarin in the Rivaroxaban once daily oral direct factor Xa inhibition compared with vitamin K antagonism for prevention of stroke and embolism trial in atrial fibrillation trial) - Balla, Somasekhara R.; Hacke, Werner (The American journal of cardiology, 2017)