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. 2016 Nov 15;2:33. doi: 10.1186/s40780-016-0067-2

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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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Cold insulators for hands (a) and feet (b). Figure 1 indicated cold insulators used in this study. The pre-cooled insulators were fitted on both hands and feet. The insulators were changed hourly