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