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. 2011 Mar 23;6(3):e17916. doi: 10.1371/journal.pone.0017916

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Pontiroli 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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Smile plot of the pairwise comparison between each method for ΔCt values (p values, Wilcoxon rank sum test) against the A260/230 ratio (expressed as proportion of the values for the two methods). The cut-off p value (0.05) and the Holland correction factor (adjusted cut-off p value 0.0253) are shown. G: Griffiths; P: Powersoil™; U: Ultraclean™; F: FastDNA® Spin kit; Q: QIAamp Stool kit.