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