title: Density dependence of forced expiratory flows. Methodological aspects.
mesh_terms: D005540:Forced Expiratory Flow Rates; D006371:Helium; D006801:Humans; D008176:Lung Volume Measurements; D008297:Male; D008448:Maximal Expiratory Flow Rate; D008449:Maximal Expiratory Flow-Volume Curves; D008875:Middle Aged; D010100:Oxygen; D010366:Peak Expiratory Flow Rate; D010993:Plethysmography, Whole Body; D012016:Reference Values; D012115:Residual Volume; D012119:Respiration; D012129:Respiratory Function Tests / Q000295:instrumentation; D013147:Spirometry; D014797:Vital Capacity
chemical_list: D006371:Helium; D010100:Oxygen