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. 2015 Sep 18;5:14230. doi: 10.1038/srep14230

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Correlations between serum levels of sαKl and IL-6 in (A) middle-aged smoker (n = 40), (B) middle-aged never-smoker (n = 40), (C) aged smoker (n = 34), and (D) aged never-smoker (n = 26).