Those devices which include a filter mechanism will remove embolic material from {HEAD ~ blood}, and thereby prevent {TAIL ~ occurrence} of ischemic stroke, myocardial infarction or systemic embolus 
prevent
Those devices which include a filter mechanism will remove embolic material from { HEAD ~ blood } , and thereby prevent { TAIL ~ occurrence } of ischemic stroke , myocardial infarction or systemic embolus
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