{HEAD ~ The operation} of {TAIL ~ the filter device} has been described as applied to the filtration of blood  
of
{ HEAD ~ The operation } of { TAIL ~ the filter device } has been described as applied to the filtration of blood
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH