7-Dehydrocholesterol:PrThr:Pt:Amnio fld:Ord
7-dehydrocholesterol:prthr:pt:amnio fld:ord
7-Dehydrocholesterol:Presence or Threshold:To identify measures at a point in time:Amniotic fluid:Ordinal
7-dehydrocholesterol:presence or threshold:to identify measures at a point in time:amniotic fluid:ordinal