title: GOLD stage 0 COPD: is it real? Does it matter?
authors.forename: David M
authors.initials: DM
authors.lastname: Mannino
mesh_terms: D018450:Disease Progression; D006801:Humans; D015994:Incidence; D029424:Pulmonary Disease, Chronic Obstructive / Q000175:diagnosis* / Q000453:epidemiology; D012307:Risk Factors; D012720:Severity of Illness Index; D015996:Survival Rate