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You are seeing a 60-year-old patient in your ED with new onset Atrial Fibrillation. His rate is 76 and his blood pressure is normal. He has a history of peripheral arterial disease and is a smoker. There is no history of diabetes, CHF, hypertension or stroke/TIA. According to the 2014 CCS guidelines on AF, which of the following is TRUE regarding his care in stroke prevention?