Mahaffey KW, Hellkamp AS, Patel MR, Hannan KL, Schwabe K, Nessel CC, Berkowitz SD, Halperin JL, Hankey GJ, Becker RC, Piccini JP, Breithardt G, Hacke W, Singer DE, Califf RM, Fox KA. End of study transition from study drug to open-label vitamin K antagonist therapy: the ROCKET AF experience. Circ Cardiovasc Qual Outcomes. 2013 Jul; 6(4):470-8.