The method 5, wherein the pores have {HEAD ~ an average diameter} of {TAIL ~ less than 5 microns} 
of
The method 5 , wherein the pores have { HEAD ~ an average diameter } of { TAIL ~ less than 5 microns }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL