Study observation:Find:Pt:Pulmonary vein^Fetus:Nar:US
study observation:find:pt:pulmonary vein^fetus:nar:us
Study observation:Finding:To identify measures at a point in time:Pulmonary vein^Fetus:Narrative:Ultrasound
study observation:finding:to identify measures at a point in time:pulmonary vein^fetus:narrative:ultrasound