Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from CRL.ASUM 1991
gestational age:time:pt:^fetus:qn:us+estimated from crl.asum 1991
Gestational age estimated from Crown rump length on US by Australian Society of Ultrasound Medicine 1991 method
gestational age estimated from crown rump length on us by australian society of ultrasound medicine 1991 method