Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from CRL.Yeh 1988
gestational age:time:pt:^fetus:qn:us+estimated from crl.yeh 1988
Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from CRL.Yeh 1988
gestational age:time:pt:^fetus:qn:us+estimated from crl.yeh 1988