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