Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from BPD.Campbell 1975
gestational age:time:pt:^fetus:qn:us+estimated from bpd.campbell 1975
Gestational age estimated from Biparietal diameter on US by Campbell 1975 method
gestational age estimated from biparietal diameter on us by campbell 1975 method