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. 2019 Jun 18;18:81. doi: 10.1186/s12933-019-0885-2

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© The Author(s) 2019

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. 2 — Forest plot of the associations between prefrailty or frailty and mortality. Hazard ratio in the individual studies are presented as squares with 95% confidence intervals (CIs) presented as extending lines. The pooled hazard ratio with its 95% CI is depicted as a diamond