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Areas under the ROC curve of the leukocyte count, percentage of segmented neutrophils (%), pH, LDH, CRP, PCT, IL-6, and TNF-α in pleural fluid for the diagnosis of infectious pleural effusion.IL6 = Interleukin 6, LDH = Lactate dehydrogenase, PF = Pleural fluid, CRP = C-reactive protein, PCT = Procalcitonin, TNF-alpha = Tumor necrosis factor alpha, ROC = Receiver operating characteristics
