Protoporphyrin.zinc:PrThr:Pt:RBC:Ord
protoporphyrin.zinc:prthr:pt:rbc:ord
Protoporphyrin.zinc:Presence or Threshold:To identify measures at a point in time:Erythrocytes:Ordinal
protoporphyrin.zinc:presence or threshold:to identify measures at a point in time:erythrocytes:ordinal