title: Temporal clustering of exacerbations of COPD: not-so-surprising findings.
authors.forename: Chu-Lin
authors.initials: CL
authors.lastname: Tsai
mesh_terms: D016000:Cluster Analysis; D014943:Global Health; D006801:Humans; D015994:Incidence; D015233:Models, Statistical; D029424:Pulmonary Disease, Chronic Obstructive / Q000453:epidemiology*; D012008:Recurrence