Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from HL.ASUM 2000
gestational age:time:pt:^fetus:qn:us+estimated from hl.asum 2000
Gestational age estimated from Humerus length on US by Australian Society of Ultrasound Medicine 2000 method
gestational age estimated from humerus length on us by australian society of ultrasound medicine 2000 method