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