Arrhythmias and sudden death Bleeding risk with rivaroxaban compared with vitamin K antagonists in patients aged 80 years or older with atrial fibrillation Olivier Hanon1, http://orcid.org/0000-0001-6770-0720Jean-Sébastien Vidal1, George Pisica-Donose1,2, Galdric Orvoën1, Jean-Philippe David3, Edouard Chaussade1, Laure Caillard1, Laura W de Jong4, Nicolas Boulloche5, Ulric Vinsonneau6, Stéphane Bouée7, Pierre Krolak-Salmon8, Laurent Fauchier9, Pierre Jouanny10, Guillaume Sacco11, Fabienne...