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