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Data are expressed as mean ± standard deviation and percentages. The independent sample t test was used to compare means. The statistical analysis was performed using SPSS version 20.0 (IBM Co., Armonk, NY, USA). Binary variables were compared with the chi-square test. A p < 0.05 was considered statistically significant.
Copyright and License information: ©2016 The Korean Association of Internal Medicine
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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