title: Empyema as an orphan disease: So many approaches and so few data.
authors.forename: John E
authors.initials: JE
authors.lastname: Heffner
mesh_terms: D003937:Diagnosis, Differential; D016724:Empyema, Pleural / Q000175:diagnosis / Q000453:epidemiology / Q000209:etiology / Q000628:therapy; D006801:Humans; D010996:Pleural Effusion / Q000150:complications; D011014:Pneumonia / Q000150:complications; D017410:Practice Guidelines as Topic; D035583:Rare Diseases / Q000175:diagnosis / Q000453:epidemiology / Q000209:etiology / Q000628:therapy