Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from HC measured.Chitty 1997
gestational age:time:pt:^fetus:qn:us+estimated from hc measured.chitty 1997
Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from HC measured.Chitty 1997
gestational age:time:pt:^fetus:qn:us+estimated from hc measured.chitty 1997