Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from HC.Hoffbauer 1979
gestational age:time:pt:^fetus:qn:us+estimated from hc.hoffbauer 1979
Gestational age estimated from Head circumference on US by Hoffbauer 1979 method
gestational age estimated from head circumference on us by hoffbauer 1979 method