Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from GSD.Hellman 1969
gestational age:time:pt:^fetus:qn:us+estimated from gsd.hellman 1969
Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from GSD.Hellman 1969
gestational age:time:pt:^fetus:qn:us+estimated from gsd.hellman 1969