Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from HC.ASUM 2000
gestational age:time:pt:^fetus:qn:us+estimated from hc.asum 2000
Gestational age estimated from Head circumference on US by Australian Society of Ultrasound Medicine 2000 method
gestational age estimated from head circumference on us by australian society of ultrasound medicine 2000 method