Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from TC.Nimrod 1986
gestational age:time:pt:^fetus:qn:us+estimated from tc.nimrod 1986
Gestational age estimated from Thoracic circumference on US by Nimrod 1986 method
gestational age estimated from thoracic circumference on us by nimrod 1986 method