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. 2017 Mar 21;17:27. doi: 10.1186/s12893-017-0222-1

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© The Author(s). 2017

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. 1 — Time to drain removal according to scalpel. Comparison of control vs. harmonic scalpel using Cox proportional hazards regression adjusting for gender, age (continuous), body mass index (−25.0 [, [25–30 [and [30+), procedure and sentinel node biopsy : hazard ratio 0.85, 95% confidence interval (0.51; 1.33), p = 0.426