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. 2018 Aug 1;8:11557. doi: 10.1038/s41598-018-29937-y

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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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Scatter plots depicting longitudinal changes in ¹⁸F-FDG uptake (n = 107). The shift in ¹⁸F-FDG uptake from the baseline PET scan to the second PET scan is shown at the participant level by the slopes connecting paired circles. The blue and red circles represent ¹⁸F-FDG uptake in the ACC and PCC/PC, respectively. ¹⁸F-FDG: fluorine-18-labeled fluorodeoxyglucose, ACC: anterior cingulate cortex, PCC/PC: posterior cingulate cortex/precuneus, PET: positron emission tomography.