Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from BPD.Osaka 1989
gestational age:time:pt:^fetus:qn:us+estimated from bpd.osaka 1989
Gestational age estimated from Biparietal diameter on US by Osaka 1989 method
gestational age estimated from biparietal diameter on us by osaka 1989 method