Meperidine+Normeperidine:PrThr:Pt:Urine:Ord:Confirm
meperidine+normeperidine:prthr:pt:urine:ord:confirm
Meperidine+Normeperidine [Presence] in Urine by Confirmatory method
meperidine+normeperidine [presence] in urine by confirmatory method