O-nortramadol:PrThr:Pt:Urine:Ord
o-nortramadol:prthr:pt:urine:ord
O-nortramadol:Presence or Threshold:To identify measures at a point in time:Urine:Ordinal
o-nortramadol:presence or threshold:to identify measures at a point in time:urine:ordinal