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. 2017 Jan 11;15:19. doi: 10.1186/s12957-016-1080-5

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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. 3 — Operation learning curve. a Unilateral vs. bilateral OP learning curve. b Unilateral OP time: divided into five groups (43–50 procedures in each group). Comparison of the average OP time and standard deviation in each group (p < 0.04). c First 50 procedures vs. last 50 procedures in the OP learning curve