Diameter:Len:Pt:Cervical canal.internal os:Qn:US.measured
diameter:len:pt:cervical canal.internal os:qn:us.measured
Diameter:Length:To identify measures at a point in time:Cervical canal.internal os:Quantitative:Ultrasound.measured
diameter:length:to identify measures at a point in time:cervical canal.internal os:quantitative:ultrasound.measured