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