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