Gestational age:Time:Pt:^Fetus:Qn:US.estimated from spine length.Tokyo 1989
gestational age:time:pt:^fetus:qn:us.estimated from spine length.tokyo 1989
Gestational age:Time:To identify measures at a point in time:^Fetus:Quantitative:Ultrasound.estimated from spine length.Tokyo 1989
gestational age:time:to identify measures at a point in time:^fetus:quantitative:ultrasound.estimated from spine length.tokyo 1989