However, {HEAD ~ these devices} do not reduce 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 , { HEAD ~ these devices } do not reduce 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 HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH 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