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. 2019 Oct 23;19:883. doi: 10.1186/s12879-019-4490-5

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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 — Differences in pain intensity between groups; a immediate pain; b 6 h after the IM injection; and c 24 h after the IM injection. Statistically significant differences on pain intensity were found between anesthesia and no-anesthesia groups regardless of the needle size (long 19G with anesthesia vs. long 19G without anesthesia, p < 0.001; and short 21G with anesthesia vs. short 21G without anesthesia, p = 0.015)