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. 2018 Apr 12;8:5891. doi: 10.1038/s41598-018-23699-3

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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One sample t-test differences of PIs subjects (A) and GSs (B) in binarized degree centrality network with threshold at r = 0.25. Note: The statistical threshold was set at FDR corrected voxel threshold of p < 0.001 with a minimum voxel volume threshold of 810 mm³. Abbreviations: PIs, Patients with primary insomnia; GSs, Good sleepers; R, right; L, left.