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Patient comorbidity data was captured using the Charlson Comorbidity Index (CCI). The age-adjusted CCI was calculated according to the reference method. CCI takes into consideration 19 diseases with a suitable weight. Additional points are added for each decade after 40 years of age (1 point for ages 41–50, 2 points for ages 51–60, 3 points for ages 61–70, and 4 points for ≥71 years of age) [14].
Copyright and License information: ©2019 by the authors.
Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
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