Head circumference/Abdominal circumference:LenRto:Pt:^Fetus:Qn:US+Estimated from Campbell 1991
head circumference/abdominal circumference:lenrto:pt:^fetus:qn:us+estimated from campbell 1991
Head circumference/Abdominal circumference US+Estimated from Campbell 1991
head circumference/abdominal circumference us+estimated from campbell 1991