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. 2016 Sep 27;30(6):781–786. doi: 10.1007/s40620-016-0352-z

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© The Author(s) 2016

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.

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Fig. 3 — The knowledge of the adverse effects of analgesics in subgroups. *χ² test p < 0.01 (difference between study subgroups: CKD 1–4 vs. CKDT vs. HD vs. PD). **χ² test p < 0.001 (difference between study subgroups: CKD 1–4 vs. CKDT vs. HD vs. PD)