Expiratory reserve:Vol:Pt:Respiratory system:Qn:Helium single breath
expiratory reserve:vol:pt:respiratory system:qn:helium single breath
Expiratory reserve:Volume:To identify measures at a point in time:Respiratory system:Quantitative:Helium single breath
expiratory reserve:volume:to identify measures at a point in time:respiratory system:quantitative:helium single breath