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. 2016 Jul 30;17(1):69. doi: 10.1186/s10194-016-0660-7

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 2 — Association between the age of healthy control subjects and their plasma PACAP-38 level (a), and the age of the ECH patients and their inter-bout plasma PACAP-38 level (b) (n = 9/group)