title: [Exacerbations complicate the prognosis].
authors.affiliation: , .
authors.forename: Peter
authors.initials: P
authors.lastname: Stiefelhagen
mesh_terms: D003131:Combined Modality Therapy; D018450:Disease Progression; D005541:Forced Expiratory Volume; D006801:Humans; D011379:Prognosis; D029424:Pulmonary Disease, Chronic Obstructive / Q000175:diagnosis* / Q000628:therapy*