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The original version of this article went online on 28 April 2019 and was erroneously updated on 12 June 2019 with the supplementary files removed. The original version was restored on 28 June 2019. The Publisher apologizes for the removal of the supplementary files, which was done without the permission of the Editor.
Many articles in the surgical literature were faulted for committing type 2 error, or concluding no difference when the study was “underpowered”. However, it is unknown if the current power standard of 0.8 is reasonable in surgical science.