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Background and purpose: The CHADS2 and CHA2DS2‐VASc scores are useful to stratify embolic risks in patients with non‐valvular atrial fibrillation (NVAF) and to identify patients eligible for anticoagulation. Although the risk of stoke increases in patients with higher CHADS2 or CHA2DS2‐VASc scores, it is uncertain why the stroke rate increases in them. Concomitant potential cardiac sources of embolism...
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