Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from OFD.ASUM 2000
gestational age:time:pt:^fetus:qn:us+estimated from ofd.asum 2000
Gestational age estimated from Occipital-frontal diameter on US by Australian Society of Ultrasound Medicine 2000 method
gestational age estimated from occipital-frontal diameter on us by australian society of ultrasound medicine 2000 method