Figure 4From: Compartment differences of inflammatory activity in chronic obstructive pulmonary diseaseRelationship between soluble TNFR1 and TNFR2. Relationship between soluble TNFR1 and TNFR2 in sputum (a), BAL fluid (b) and serum (c). Rho indicates coefficient of correlation according to Spearman.Back to article page