title: Empyema: an increasing concern in Canada.
authors.forename: Sheldon
authors.initials: S
authors.lastname: Spier
mesh_terms: D002170:Canada / Q000453:epidemiology; D002648:Child; D016724:Empyema, Pleural / Q000453:epidemiology* / Q000382:microbiology; D006801:Humans; D012307:Risk Factors