Gestational age:Time:Pt:^Fetus:Qn:US.estimated from ulna length.Merz 1987
gestational age:time:pt:^fetus:qn:us.estimated from ulna length.merz 1987
Gestational age estimated from Ulna length by method of Merz 1987 (US)
gestational age estimated from ulna length by method of merz 1987 (us)