Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from BPD.Lessoway 1998
gestational age:time:pt:^fetus:qn:us+estimated from bpd.lessoway 1998
Gestational age estimated from Biparietal diameter on US by Lessoway 1998 method
gestational age estimated from biparietal diameter on us by lessoway 1998 method