Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from GSL.Nyberg 1992
gestational age:time:pt:^fetus:qn:us+estimated from gsl.nyberg 1992
Gestational age estimated from Gestational sac length on US by Nyberg 1992 method
gestational age estimated from gestational sac length on us by nyberg 1992 method