title: Frequent exacerbators in COPD: who are they?
authors.forename: Claudio
authors.initials: C
authors.lastname: Sorino
authors.forename: Duane
authors.initials: D
authors.lastname: Sherrill
mesh_terms: D014943:Global Health; D006801:Humans; D015994:Incidence; D011379:Prognosis; D029424:Pulmonary Disease, Chronic Obstructive / Q000453:epidemiology*; D012307:Risk Factors; D055502:Secondary Prevention