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. 2019 Apr 24;18(Suppl 1):19. doi: 10.1186/s12893-019-0473-0

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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. 4 — a Landmarks: two dots mark the sternal notch and the cricoid cartilage, the mark at the inferior end of the future axillary incision is connected to the sternal dot by an imaginary transverse line; the mark at the upper end of the future axillary incision is connected to the cricoid dot by an imaginary line forming an angle of approximately 60° with the neck midline; b Landmarks: detail of the markings for the axillary incision (cephalad and middle dot) and for an accessory trocar (caudal dot) for retraction