GOLD stage I is not a COPD risk factor.
Enright
Paul L
PL
D005541:Forced Expiratory Volume / Q000502:physiology; D006801:Humans; D029424:Pulmonary Disease, Chronic Obstructive / Q000503:physiopathology*; D012307:Risk Factors; D014797:Vital Capacity / Q000502:physiology