Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from CRL.Hansmann 1986
gestational age:time:pt:^fetus:qn:us+estimated from crl.hansmann 1986
Gestational age estimated from Crown rump length on US by Hansmann 1986 method
gestational age estimated from crown rump length on us by hansmann 1986 method