Fentanyl+Norfentanyl:PrThr:Pt:Urine:Ord:Confirm
fentanyl+norfentanyl:prthr:pt:urine:ord:confirm
fentaNYL+Norfentanyl [Presence] in Urine by Confirmatory method
fentanyl+norfentanyl [presence] in urine by confirmatory method