Xylazine:PrThr:Pt:Ser/Plas:Ord
xylazine:prthr:pt:ser/plas:ord
Xylazine:Presence or Threshold:To identify measures at a point in time:Serum/Plasma:Ordinal
xylazine:presence or threshold:to identify measures at a point in time:serum/plasma:ordinal