Perimeter:Len:Pt:Head^Fetus:Qn:US.derived from OFD&O-I BPD
perimeter:len:pt:head^fetus:qn:us.derived from ofd&o-i bpd
Perimeter:Length:To identify measures at a point in time:Head^Fetus:Quantitative:Ultrasound.derived from OFD&O-I BPD
perimeter:length:to identify measures at a point in time:head^fetus:quantitative:ultrasound.derived from ofd&o-i bpd