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. 2015 Mar 26;10(3):e0121913. doi: 10.1371/journal.pone.0121913

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© 2015 Lin et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 2 — A: concentration of CNP was positively correlated with the upright maximum heart rate. Correlation coefficient r = 0.445, r² = 0.20, (P < 0.001); B: concentration of plasma CNP was positively associated with increased value of heart rate from supine to upright. Correlation coefficient r = 0.434, r² = 0.19, (P < 0.001); C: concentration of plasma CNP was positively correlated with symptom scores. Correlation coefficient r = 0.361, r² = 0.13, (P < 0.01)