As discussed above, {HEAD ~ numerous medical devices} have been proposed for {TAIL ~ atherectomy} in the coronary arteries 
proposed for
As discussed above , { HEAD ~ numerous medical devices } have been proposed for { TAIL ~ atherectomy } in the coronary arteries
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH