Accuracy of chest sonography and polymorphonuclear elastase in the assessment of bacterial pleural effusion - Aleman, Carmen; Alegre, Jose; Andreu, Jordi; Segura, Rosa MA; Armadans, Lluis; Sureda, Delia; Vazquez, Ana; Iglesias, Daniel; Fernandez de Sevilla, Tomas (European Journal Of Internal Medicine, 2004)