title: [Severity of COPD. What formula applies?].
authors.forename: Petra
authors.initials: P
authors.lastname: Schulz
mesh_terms: D005541:Forced Expiratory Volume; D006801:Humans; D029424:Pulmonary Disease, Chronic Obstructive / Q000145:classification* / Q000175:diagnosis; D012720:Severity of Illness Index; D014797:Vital Capacity