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Atrial fibrillation (AF) afflicts over 33 million people worldwide, the large majority of them older than 65, and increases embolic stroke risk fourfold to fivefold. This stroke risk can be reduced by two thirds or more with anticoagulation, although this benefit is balanced by an increased risk of bleeding. Guidelines recommend use of the CHA2DS2-VASc risk score to estimate annual stroke risk and...
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