Diagnosing COPD in non-smokers: splitting not lumping.
Chilvers
Edwin R
ER
Lomas
David A
DA
D000368:Aged; D006801:Humans; D029424:Pulmonary Disease, Chronic Obstructive / Q000175:diagnosis* / Q000453:epidemiology / Q000209:etiology; D012907:Smoking / Q000009:adverse effects; D013147:Spirometry; D006113:United Kingdom / Q000453:epidemiology