The devices additionally contain a surfactant erosion rate modifier that cooperates with and interacts with {HEAD ~ polymers} for regulating the rate of erosion of {TAIL ~ the polymers} 
The devices additionally contain a surfactant erosion rate modifier that cooperates with and interacts with { HEAD ~ polymers } for regulating the rate of erosion of { TAIL ~ the polymers }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL