Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from BPD.ASUM 1989
gestational age:time:pt:^fetus:qn:us+estimated from bpd.asum 1989
Gestational age estimated from Biparietal diameter on US by Australian Society of Ultrasound Medicine 1989 method
gestational age estimated from biparietal diameter on us by australian society of ultrasound medicine 1989 method