New oral anticoagulants are used increasingly as a first-line treatment for non-valvular atrial fibrillation stroke prevention due to its good efficiency and safety.However,these new oral anticoagulants are expensive and are inappropriate for pregnant women,children,or patients with valvular heart disease or severe renal insufficiency.Therefore,most patients still need to use Warfarin for treatment.Warfarin is recommended for use in the prevention and cure of systemic thrombosis,stroke,and venous thromboemb...