Synthetic fentanyl analogs:PrThr:Pt:Urine:Ord
synthetic fentanyl analogs:prthr:pt:urine:ord
Synthetic fentanyl analogs:Presence or Threshold:To identify measures at a point in time:Urine:Ordinal
synthetic fentanyl analogs:presence or threshold:to identify measures at a point in time:urine:ordinal