Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from CRL.Shinozuka 1996
gestational age:time:pt:^fetus:qn:us+estimated from crl.shinozuka 1996
Gestational age estimated from Crown rump length on US by Shinozuka 1996 method
gestational age estimated from crown rump length on us by shinozuka 1996 method