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. 2021 Dec 3;10:241. doi: 10.1038/s41377-021-00682-8

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© The Author(s) 2021

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. 5 — a Typical blood flow maps of subcutaneous blood vessels before and after the injection of Ach. The blue and green asterisks state the femoral vein and its branch. b, c Statistical analysis based on blood vessel positions indicated by asterisks in the blue and green solid line rectangular boxes was performed to show the relative changes in blood flow of femoral vein (b) and its branch (c) over time. Data are expressed in (mean ± standard error)