Hepatitis B virus surface Ag:PrThr:Pt:^Mother:Ord
hepatitis b virus surface ag:prthr:pt:^mother:ord
Hepatitis B virus surface Antigen:Presence or Threshold:To identify measures at a point in time:^Mother:Ordinal
hepatitis b virus surface antigen:presence or threshold:to identify measures at a point in time:^mother:ordinal