title: Definition of COPD GOLD stage I.
authors.forename: Edward L
authors.initials: EL
authors.lastname: Petsonk
authors.forename: Eva
authors.initials: E
authors.lastname: Hnizdo
authors.forename: Michael
authors.initials: M
authors.lastname: Attfield
mesh_terms: D002648:Child; D005541:Forced Expiratory Volume / Q000502:physiology; D006801:Humans; D029424:Pulmonary Disease, Chronic Obstructive / Q000175:diagnosis*