Perimeter:Len:Pt:Head^Fetus:Qn:US.estimated from Merz 1988
perimeter:len:pt:head^fetus:qn:us.estimated from merz 1988
Perimeter:Length:To identify measures at a point in time:Head^Fetus:Quantitative:Ultrasound.estimated from Merz 1988
perimeter:length:to identify measures at a point in time:head^fetus:quantitative:ultrasound.estimated from merz 1988