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