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