Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from IOD.Trout 1994
gestational age:time:pt:^fetus:qn:us+estimated from iod.trout 1994
Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from IOD.Trout 1994
gestational age:time:pt:^fetus:qn:us+estimated from iod.trout 1994