title: Conflicting definitions of airways obstruction: Drawing the line between normal and abnormal.
authors.forename: Mary C
authors.initials: MC
authors.lastname: Townsend
mesh_terms: D005541:Forced Expiratory Volume / Q000502:physiology; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000175:diagnosis* / Q000503:physiopathology*; D011237:Predictive Value of Tests; D013147:Spirometry; D014797:Vital Capacity / Q000502:physiology