Safety of switching from vitamin K antagonist to non-vitamin K antagonist oral anticoagulant in frail elderly with atrial fibrillation: rationale and design of the FRAIL-AF randomi... by Arno W Hoes, Frans H Rutten, Menno V Huisman, Geert-Jan Geersing, Linda P T Joosten, Sander van Doorn, Melchior C Nierman, Nynke M Wiersma, Huiberdina L Koek, Martin E W Hemels, Kit C Roes, Rutger M van den Bor, Wim F Buding

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