Perimeter:Len:Pt:Thorax^Fetus:Qn:US.traced
perimeter:len:pt:thorax^fetus:qn:us.traced
Perimeter:Length:To identify measures at a point in time:Thorax^Fetus:Quantitative:Ultrasound.traced
perimeter:length:to identify measures at a point in time:thorax^fetus:quantitative:ultrasound.traced