Peak flow measure duration:Time:*:Respiratory system.airway:Qn:Peak flow meter
peak flow measure duration:time:*:respiratory system.airway:qn:peak flow meter
Peak flow measure duration:Time:LIFE OF THE UNIT:Respiratory system.airway:Quantitative:Peak flow meter
peak flow measure duration:time:life of the unit:respiratory system.airway:quantitative:peak flow meter