title: The incidence and clinical correlates of parapneumonic effusions in pneumococcal pneumonia.
mesh_terms: D000328:Adult; D000368:Aged; D004653:Empyema / Q000209:etiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010996:Pleural Effusion / Q000000981:diagnostic imaging / Q000209:etiology*; D011018:Pneumonia, Pneumococcal / Q000150:complications* / Q000000981:diagnostic imaging; D011446:Prospective Studies; D011859:Radiography