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Figure 5 Levels of 2,3-dihydroxybenzoic acid (DHBA)/salicylic acid (SA) at six months, according to heart failure status. At month 6, 2,3-DHBA/SA (expressed as molar ratio x 1,000) in patients with heart failure (Group 2Bii) was significantly higher than that of patients without heart failure (Group 2Ai). *p < 0.0001.