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. 2018 Jul 3;38:44. doi: 10.1186/s40880-018-0308-x

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© The Author(s) 2018

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 — Map of the units (cities and counties) included in data analysis. Red: high life expectancy level units (life expectancy > 80 years); orange: middle life expectancy level units (life expectancy 76.0–80.0 years); green: low life expectancy level units (life expectancy < 76.0 years)