title: The flow-volume loop: reproducibility of air and helium-based tests in normal subjects.
mesh_terms: D000328:Adult; D000388:Air; D000704:Analysis of Variance; D005260:Female; D006371:Helium; D006801:Humans; D008168:Lung / Q000502:physiology; D008297:Male; D008449:Maximal Expiratory Flow-Volume Curves; D012129:Respiratory Function Tests / Q000379:methods*
chemical_list: D006371:Helium