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Serum levels of TNF-α, sTNFR-p55 and TNFR-p75 in 105 patients with chronic HCV infection and different histological activity (68 patients with histological activity index (H.A.I.) 1–4 and 37 patients with H.A.I. 5–9, respectively) compared with 48 healthy controls. Data are presented using the box plot model. Significance is given as *P < 0.001 (Mann–Whitney U-test).
