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The CHADS-VASc score can be considered an extension of the CHADS2 scheme by considering additional stroke risk factors that may influence a decision whether or not to anticoagulate.
Lip GY, Nieuwlaat R, Pisters R, Lane DA, Crijns HJ. Refining clinical risk stratification for predicting stroke and thromboembolism in atrial fibrillation using a novel risk factor-based approach: the euro heart survey on atrial fibrillation. Chest. 2010 Feb; 137(2):263-72.