However, these devices do not reduce {HEAD ~ the risk} of embolization associated with {TAIL ~ such procedures}; the catheters themselves are likely to dislodge plaque material during positioning, and these devices do not include structures to prevent escape of embolic material 
However , these devices do not reduce { HEAD ~ the risk } of embolization associated with { TAIL ~ such procedures } ; the catheters themselves are likely to dislodge plaque material during positioning , and these devices do not include structures to prevent escape of embolic material
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH 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 OTH OTH OTH OTH OTH OTH