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