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. 2015 Apr 15;13:19. doi: 10.1186/s12947-015-0015-6

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© De Geer et al.; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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The correlation between and Bland-Altman analysis of é and E/é measured by two observers. Pearson’s correlation coefficient, mean measurements, differences and 95% limits of agreement (1.96 SD) between measurements by two observers.