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. 2020 Jul 24;5:119. doi: 10.1038/s41392-020-0171-5

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© The Author(s) 2020

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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Fig. 1 — Heart function and melatonin levels in Alzheimer’s disease patients and age-matched controls. a Heart rate; b end systolic volume; c end diastolic volume; d ejection fraction (%); e stroke volume; f septum wall thickness; g dP/dT; h LVDP (left ventricular diastolic pressure); and i circulating melatonin concentration. The data are shown as the mean ± SEM, n = 26 individuals per group, and all p-values shown were calculated using Student’s t-tests