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. 2018 Jan 11;17:16. doi: 10.1186/s12904-017-0269-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 — Sample selection process. From 2001 to 2014, 3,535,697 deaths were registered in South Korea. Among those, 2,408,040 deaths were older decedents (age 65 and over). Data was excluded if there was missing in marital status, education level, death age. Percentage of elimination was 2%. Final analysis included 2,358,211 deaths