Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from CRL.Daya 1993
gestational age:time:pt:^fetus:qn:us+estimated from crl.daya 1993
Gestational age estimated from Crown rump length on US by Daya 1993 method
gestational age estimated from crown rump length on us by daya 1993 method