Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from OOD.Mayden 1982
gestational age:time:pt:^fetus:qn:us+estimated from ood.mayden 1982
Gestational age estimated from Outer orbital distance on US by Mayden 1982 method
gestational age estimated from outer orbital distance on us by mayden 1982 method