Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from TTD.Lessoway 1998
gestational age:time:pt:^fetus:qn:us+estimated from ttd.lessoway 1998
Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from TTD.Lessoway 1998
gestational age:time:pt:^fetus:qn:us+estimated from ttd.lessoway 1998