Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from FL.Merz 1987
gestational age:time:pt:^fetus:qn:us+estimated from fl.merz 1987
Gestational age estimated from Femur length on US by Merz 1987 method
gestational age estimated from femur length on us by merz 1987 method