Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from BPD.Kurtz 1980
gestational age:time:pt:^fetus:qn:us+estimated from bpd.kurtz 1980
Gestational age estimated from Biparietal diameter on US by Kurtz 1980 method
gestational age estimated from biparietal diameter on us by kurtz 1980 method