title: The EXACT-Pro: measuring exacerbations of COPD.
authors.forename: Bartolome R
authors.initials: BR
authors.lastname: Celli
authors.forename: Jørgen
authors.initials: J
authors.lastname: Vestbo
mesh_terms: D018450:Disease Progression; D006801:Humans; D029424:Pulmonary Disease, Chronic Obstructive / Q000150:complications / Q000175:diagnosis*; D012720:Severity of Illness Index