Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from AC.Merz 1988
gestational age:time:pt:^fetus:qn:us+estimated from ac.merz 1988
Gestational age estimated from Abdominal circumference on US by Merz 1988 method
gestational age estimated from abdominal circumference on us by merz 1988 method