Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from HC.Hadlock 1982
gestational age:time:pt:^fetus:qn:us+estimated from hc.hadlock 1982
Gestational age estimated from Head circumference on US by Hadlock 1982 method
gestational age estimated from head circumference on us by hadlock 1982 method