The method 2, wherein said substance is selected from {HEAD ~ the group} consisting of: urea, creatinine, vitamin B12, beta two microglobuline and {TAIL ~ glucose} 
consisting of
The method 2 , wherein said substance is selected from { HEAD ~ the group } consisting of : urea , creatinine , vitamin B12 , beta two microglobuline and { TAIL ~ glucose }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL