IL6 and hydrops fetalis: In the same study in 75 hospitalized HF patients, a weak correlation for serum–salivary IL-6 (r = 0.288, p = 0.037), and no correlations for serum–salivary IL-10 (r = 0.068, p = 0.629) or serum–salivary BNP (r = −0.064, p = 0.628) were reported [29].