Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from HC.Lessoway 1998
gestational age:time:pt:^fetus:qn:us+estimated from hc.lessoway 1998
Gestational age estimated from Head circumference on US by Lessoway 1998 method
gestational age estimated from head circumference on us by lessoway 1998 method