A-C duration:Time:Pt:Heart.valve.XXX:Qn:US
a-c duration:time:pt:heart.valve.xxx:qn:us
A-C duration:Time:To identify measures at a point in time:Heart.valve.Not specified:Quantitative:Ultrasound
a-c duration:time:to identify measures at a point in time:heart.valve.not specified:quantitative:ultrasound