Occipital frontal diameter:Len:Pt:Head^Fetus:Qn:US.estimated from ASUM 2000
occipital frontal diameter:len:pt:head^fetus:qn:us.estimated from asum 2000
Occipital frontal diameter estimated from gestational age by method of Australian Society of Ultrasound Medicine 2000 (US)
occipital frontal diameter estimated from gestational age by method of australian society of ultrasound medicine 2000 (us)